Tests - Small helper to have a file path in Playwright

[Gustry]

Follow up from #5376

[3liz-bot]

The backport to release_3_8 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 683c6821c... Tests - Small helper to have a file path in Playwright
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

stdout

Auto-merging tests/end2end/playwright/axis_orientation.spec.js
CONFLICT (content): Merge conflict in tests/end2end/playwright/axis_orientation.spec.js
Auto-merging tests/end2end/playwright/base-layers.spec.js
CONFLICT (content): Merge conflict in tests/end2end/playwright/base-layers.spec.js
Auto-merging tests/end2end/playwright/globals.js
CONFLICT (content): Merge conflict in tests/end2end/playwright/globals.js
Auto-merging tests/end2end/playwright/print_in_project_projection.spec.js
CONFLICT (content): Merge conflict in tests/end2end/playwright/print_in_project_projection.spec.js
Auto-merging tests/end2end/playwright/webdav-upload.spec.js
CONFLICT (content): Merge conflict in tests/end2end/playwright/webdav-upload.spec.js

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release_3_8 release_3_8
# Navigate to the new working tree
cd .worktrees/backport-release_3_8
# Create a new branch
git switch --create backport-5387-to-release_3_8
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 683c6821c419df79de88cfb20ce16cd894c45a1c
# Push it to GitHub
git push --set-upstream origin backport-5387-to-release_3_8
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release_3_8

Then, create a pull request where the base branch is release_3_8 and the compare/head branch is backport-5387-to-release_3_8.