✨ Extend ControlPlane/ MD / MP builtin to include metadata

[srm09]

What this PR does / why we need it:
This patch extends the MachineDeployment and MachinePool builtins to include metadata from topology MachineDeployment and topology MachinePool respectively.

Which issue(s) this PR fixes:
Fixes #10836

/area clusterclass

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[srm09]

The original issue only talks about MachineDeployment builtins, but when implementing I realized that this could be a requirement on the MachinePool builtins as well. Hence included that in the PR as well.

[sbueringer]

The original issue only talks about MachineDeployment builtins, but when implementing I realized that this could be a requirement on the MachinePool builtins as well. Hence included that in the PR as well.

Sounds good. Let's do the same for control plane.

[srm09]

/retitle ✨ Extend ControlPlane/Deployment/Pool builtin to include metadata

[sbueringer]

Thank you!

/lgtm
/approve

[sbueringer]

/cherry-pick release-1.7

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5bf5ca63e3006fe749704f3480afb118c2d60f3e

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.7 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-infra-cherrypick-robot]

@sbueringer: #10837 failed to apply on top of branch "release-1.7":

Applying: Extend ControlPlane/Deployment/Pool builtin to include metadata
Using index info to reconstruct a base tree...
M	docs/book/src/tasks/experimental-features/cluster-class/write-clusterclass.md
M	exp/runtime/hooks/api/v1alpha1/topologymutation_variable_types.go
M	exp/runtime/hooks/api/v1alpha1/zz_generated.openapi.go
M	internal/controllers/topology/cluster/patches/variables/variables.go
M	internal/test/builder/builders.go
M	internal/test/builder/zz_generated.deepcopy.go
Falling back to patching base and 3-way merge...
Auto-merging internal/test/builder/zz_generated.deepcopy.go
Auto-merging internal/test/builder/builders.go
Auto-merging internal/controllers/topology/cluster/patches/variables/variables.go
Auto-merging exp/runtime/hooks/api/v1alpha1/zz_generated.openapi.go
Auto-merging exp/runtime/hooks/api/v1alpha1/topologymutation_variable_types.go
Auto-merging docs/book/src/tasks/experimental-features/cluster-class/write-clusterclass.md
CONFLICT (content): Merge conflict in docs/book/src/tasks/experimental-features/cluster-class/write-clusterclass.md
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Extend ControlPlane/Deployment/Pool builtin to include metadata
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.