✨ ClusterClass: use exact versions from ClusterClass, stop api bump in CC

[sbueringer]

What this PR does / why we need it:
WIP => only first version, unit tests are not complete yet

Condition will be implemented in a separate PR.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #7212

[fabriziopandini]

quick, pass, overall lgtm.
it is great to see this happen, it can really simplify the UX for management cluster upgrades when using ClusterClass

[sbueringer]

@fabriziopandini Should be ready for another round of review now.

cc @killianmuldoon

[sbueringer]

/assign @fabriziopandini

[sbueringer]

@fabriziopandini PTAL. Findings should be addressed or answered

[sbueringer]

/test pull-cluster-api-e2e-full-main

[fabriziopandini]

/lgtm

@killianmuldoon PTAL

[sbueringer]

Squashed the last fix

[sbueringer]

/test pull-cluster-api-e2e-full-main

[killianmuldoon]

/lgtm

[sbueringer]

Thx for thr reviews!

/approve

[k8s-ci-robot]

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[sbueringer]

Given this fixes / significantly improves the behavior during Cluster API upgrades I would like to cherry-pick this into the 1.2.x release

/cherry-pick release-1.2

(cc @fabriziopandini )

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.2 in a new PR and assign it to you.

In response to this:

Given this fixes the behavior during Cluster API upgrades I would like to cherry-pick this into the 1.2.x release

/cherry-pick release-1.2

(cc @fabriziopandini )

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/test-infra repository.

[k8s-infra-cherrypick-robot]

@sbueringer: #7231 failed to apply on top of branch "release-1.2":

Applying: ClusterClass: use exact versions from ClusterClass, stop api bump in CC
Using index info to reconstruct a base tree...
M	internal/controllers/clusterclass/clusterclass_controller.go
M	internal/controllers/topology/cluster/current_state.go
M	internal/controllers/topology/cluster/current_state_test.go
M	internal/controllers/topology/cluster/desired_state.go
M	internal/controllers/topology/cluster/desired_state_test.go
M	internal/controllers/topology/cluster/util_test.go
Falling back to patching base and 3-way merge...
Auto-merging internal/controllers/topology/cluster/util_test.go
Auto-merging internal/controllers/topology/cluster/desired_state_test.go
Auto-merging internal/controllers/topology/cluster/desired_state.go
CONFLICT (content): Merge conflict in internal/controllers/topology/cluster/desired_state.go
Auto-merging internal/controllers/topology/cluster/current_state_test.go
CONFLICT (content): Merge conflict in internal/controllers/topology/cluster/current_state_test.go
Auto-merging internal/controllers/topology/cluster/current_state.go
Auto-merging internal/controllers/clusterclass/clusterclass_controller.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 ClusterClass: use exact versions from ClusterClass, stop api bump in CC
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:

Given this fixes / significantly improves the behavior during Cluster API upgrades I would like to cherry-pick this into the 1.2.x release

/cherry-pick release-1.2

(cc @fabriziopandini )

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/test-infra repository.

[sbueringer]

Manual cherry-pick > #7306