Add vpa release pipeline

[voelzmo]

What this PR does / why we need it: Add a pipeline to release VPA from our fork. We're currently looking into releasing a forked VPA in the context of a complex bug where we need more debug output in the logs in case the bug occurs. This won't be a change that will be merged upstream and will only be of temporary nature.

Release note:

NONE

[gardener-robot-ci-1]

This PR proposes changes that would break the pipeline definition:

<invalid YAML>: while parsing a block mapping
  in "<unicode string>", line 92, column 11:
              vpa-recommender:
              ^
expected <block end>, but found '<block mapping start>'
  in "<unicode string>", line 110, column 12:
               vpa-admission-controller:
               ^

[himanshu-kun]

/needs second-opinion @rishabh-11 @elankath

[gardener-robot]

@himanshu-kun Labels needs/@elankath, needs/@rishabh-11 do not exist.

[gardener-robot-ci-1]

The pipeline-definition has been fixed.

[gardener-robot]

@unmarshall, @rishabh-11 You have pull request review open invite, please check

[gardener-robot-ci-3]

This PR proposes changes that would break the pipeline definition:

vertical-pod-autoscaler-enh_add-vpa-release-pipeline: Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/concourse/replicator.py", line 141, in render
    definition_descriptor = self._render(definition_descriptor)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/concourse/replicator.py", line 185, in _render
    'definition': factory.create_pipeline_definition(),
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/concourse/factory.py", line 83, in create_pipeline_definition
    variant = self._create_variant(
              ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/concourse/factory.py", line 138, in _create_variant
    variant._traits_dict = self._create_traits(raw_dict, variant_name)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/concourse/factory.py", line 189, in _create_traits
    traits_dict = {
                  ^
  File "/usr/lib/python3.11/site-packages/concourse/factory.py", line 190, in <dictcomp>
    name: TraitsFactory.create(
          ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/concourse/model/traits/__init__.py", line 68, in create
    raise ModelValidationError('no such trait: ' + str(name))
model.base.ModelValidationError: no such trait: git_tags

[gardener-robot-ci-1]

The pipeline-definition has been fixed.