feat: Serving GA for 1.5

[vigith]

Explain what this PR does.

[codecov]

Codecov Report

Attention: Patch coverage is 25.71429% with 52 lines in your changes missing coverage. Please review.

Project coverage is 70.97%. Comparing base (1dc2b31) to head (af96758).

Files with missing lines	Patch %	Lines
pkg/apis/numaflow/v1alpha1/serving_store.go	0.00%	33 Missing ⚠️
pkg/apis/numaflow/v1alpha1/vertex_types.go	46.66%	6 Missing and 2 partials ⚠️
pkg/apis/numaflow/v1alpha1/sink.go	0.00%	2 Missing and 1 partial ⚠️
pkg/apis/numaflow/v1alpha1/source.go	0.00%	2 Missing and 1 partial ⚠️
pkg/apis/numaflow/v1alpha1/udf.go	66.66%	2 Missing and 1 partial ⚠️
pkg/apis/numaflow/v1alpha1/pipeline_types.go	83.33%	1 Missing ⚠️
pkg/apis/numaflow/v1alpha1/serving_source.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2422      +/-   ##
==========================================
- Coverage   71.16%   70.97%   -0.19%     
==========================================
  Files         368      369       +1     
  Lines       53575    53643      +68     
==========================================
- Hits        38124    38073      -51     
- Misses      14369    14486     +117     
- Partials     1082     1084       +2     

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