add pause handling for AzureManagedControlPlane

[nojnhuh]

What type of PR is this?
/kind feature

What this PR does / why we need it:

This PR adds the capability for the AzureManagedControlPlane controller to react when resources are paused using the same pattern as #3735. See that PR for more context.

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 #3525

Special notes for your reviewer:

• cherry-pick candidate

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note:

NONE

[nojnhuh]

(squash reminder)
/hold

[codecov]

Codecov Report

Patch coverage: 63.41% and project coverage change: +0.30% 🎉

Comparison is base (3d85151) 54.43% compared to head (2a939cc) 54.74%.
Report is 2 commits behind head on main.

❗ Current head 2a939cc differs from pull request most recent head 150f44f. Consider uploading reports for the commit 150f44f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3783      +/-   ##
==========================================
+ Coverage   54.43%   54.74%   +0.30%     
==========================================
  Files         187      187              
  Lines       19029    19051      +22     
==========================================
+ Hits        10359    10429      +70     
+ Misses       8113     8057      -56     
- Partials      557      565       +8     

Files Changed	Coverage Δ
controllers/azuremanagedcontrolplane_controller.go	40.66% <48.27%> (+20.06%)	⬆️
controllers/azuremanagedcontrolplane_reconciler.go	38.23% <100.00%> (+38.23%)	⬆️

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

[mboersma]

/lgtm

(My multiline string comment is just a style thing.) Looks good. I compared it to #3735.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5320f19a7b31e47664d07f40ba54f284e06d30ee

[willie-yao]

For predicates.Any(), doesn't it return true if any of the predicates inside return true? If so, in this case shouldn't we be only returning true if all three are true?

[nojnhuh]

This was adapted from ClusterUnpausedAndInfrastructureReady to essentially remove the ClusterCreateNotPaused condition and replace ClusterUpdateUnpaused with ClusterUpdatePauseChange. https://github.com/kubernetes-sigs/cluster-api/blob/54dfd423d80e42f79c33c0149f9719dba3863f11/util/predicates/cluster_predicates.go#L221

These update predicates only look at one particular change of a resource and not just its updated state, so ClusterUpdateInfraReady only passes if the old object's infra is not ready and the updated object's is, and that likely won't correspond to the same update when a Cluster is paused/unpaused, so we need Any to check if any of those things happened in a particular update and ignore all other ones.

[mboersma]

/lgtm

Pending squash of commits.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 1826820a17dd7df50db4e60021f79eb3f2e9dd91

[nojnhuh]

squashed!
/hold cancel

[mboersma]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [mboersma]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment