feat: remove code and tests related to python 3.7 (#12175)

This change removes code and tests related to Python 3.7.

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

---------

Co-authored-by: Taegyun Kim <[email protected]>

.github/workflows/generate-package-versions.yml

@@ -19,11 +19,6 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Setup Python 3.7
-        uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
-        with:
-          python-version: "3.7"
-
       - name: Setup Python 3.8
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:

.github/workflows/generate-supported-versions.yml

@@ -17,11 +17,6 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Setup Python 3.7
-        uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
-        with:
-          python-version: "3.7"
-
       - name: Setup Python 3.8
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
@@ -46,7 +41,7 @@ jobs:
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
           python-version: "3.12"
-    
+
       - name: Setup Python 3.13
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
@@ -70,18 +65,18 @@ jobs:
           pip install requests
           pip install riot==0.20.1
           pip install wrapt==1.16.0
-      
+
       - name: Install ddtrace
         run: |
           pip install -e .
 
       - run: python scripts/freshvenvs.py generate
-      
+
       - name: Generate table
         run: python scripts/generate_table.py
 
       - run: git diff
-      
+
       - name: Create Pull Request
         id: pr
         uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c # v6.1.0
@@ -96,7 +91,7 @@ jobs:
           body: |
             Generates / updates the supported versions table for integrations.
             This should be tied to releases, or triggered manually.
-            Workflow runs: [Generate Supported Integration Versions](https://github.com/DataDog/dd-trace-py/actions/workflows/generate-supported-versions.yml)  
+            Workflow runs: [Generate Supported Integration Versions](https://github.com/DataDog/dd-trace-py/actions/workflows/generate-supported-versions.yml)
 
             ## Checklist
             - [x] PR author has checked that all the criteria below are met

.github/workflows/requirements-locks.yml

@@ -23,7 +23,7 @@ jobs:
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
       - name: Set python interpreters
-        run: pyenv global 3.10 3.7 3.8 3.9 3.11 3.12 3.13
+        run: pyenv global 3.10 3.8 3.9 3.11 3.12 3.13
 
       - name: Install Dependencies
         run: pip install --upgrade pip && pip install riot==0.20.1

.github/workflows/unit_tests.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         # Keep this in sync with hatch.toml
-        python-version: ["3.7", "3.10", "3.12"]
+        python-version: ["3.10", "3.12"]
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.gitlab/package.yml

@@ -19,8 +19,6 @@ download_dependency_wheels:
   needs: [ download_ddtrace_artifacts ]
   parallel:
     matrix: # The image tags that are mirrored are in: https://github.com/DataDog/images/blob/master/mirror.yaml
-      - PYTHON_IMAGE_TAG: "3.7"
-        PYTHON_VERSION: "3.7"
       - PYTHON_IMAGE_TAG: "3.8"
         PYTHON_VERSION: "3.8"
       - PYTHON_IMAGE_TAG: "3.9.13"

.gitlab/testrunner.yml

@@ -5,5 +5,5 @@
   timeout: 20m
   before_script:
     - ulimit -c unlimited
-    - pyenv global 3.12 3.7 3.8 3.9 3.10 3.11 3.13
+    - pyenv global 3.12 3.8 3.9 3.10 3.11 3.13
     - export _CI_DD_AGENT_URL=http://${HOST_IP}:8126/

.gitlab/tests.yml

@@ -56,7 +56,7 @@ build_base_venvs:
   stage: riot
   parallel:
     matrix:
-      - PYTHON_VERSION: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+      - PYTHON_VERSION: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
   variables:
     CMAKE_BUILD_PARALLEL_LEVEL: 12
     PIP_VERBOSE: 1