feat: rolling update for Pipeline Vertex

[whynowy]

RollingUpdate for Pipeline.

apiVersion: numaflow.numaproj.io/v1alpha1
kind: Pipeline
metadata:
  name: simple-pipeline
spec:
  vertices:
    - name: my-vertex
      updateStrategy:
        rollingUpdate:
          maxUnavailable: 25%
        type: RollingUpdate

[codecov]

Codecov Report

Attention: Patch coverage is 51.41700% with 120 lines in your changes missing coverage. Please review.

Project coverage is 63.25%. Comparing base (2189ea9) to head (a0d24a7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/vertex/controller.go	52.52%	65 Missing and 29 partials ⚠️
pkg/reconciler/monovertex/controller.go	0.00%	19 Missing ⚠️
pkg/reconciler/pipeline/controller.go	65.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2040      +/-   ##
==========================================
+ Coverage   62.50%   63.25%   +0.74%     
==========================================
  Files         319      319              
  Lines       29088    29171      +83     
==========================================
+ Hits        18182    18451     +269     
+ Misses       9921     9710     -211     
- Partials      985     1010      +25     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[vigith]

how is this used?

[whynowy]

Displayed in kubectl get vtx.

[th0ger]

Hey. When reading Relase notes I have to dig deep to understand new features:
Changelog -> PR -> Linked issue -> Changed files -> Updated Markdown -> Open the updated webdocs.
Would be so nice if you could link to the updated web docs directly in the release notes :-)

For example rolling updates -> https://numaflow.numaproj.io/user-guide/reference/configuration/update-strategy/#update-strategy