Make sure local cluster is always in the managedcluster list

[coleenquadros]

• Make sure local-cluster is always a part of internal managedcluster list and not depend on the CRUD events of the Managedcluster resource because when disableHubSelfManagement: true, the resource for local-cluster will not be created.
• Use sync.Map for thread safe read and writes
• fix unit tests to run predicate tests against managedcluster resource and not deployment

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: coleenquadros, subbarao-meduri

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](https://github.com/stolostron/multicluster-observability-operator/blob/main/OWNERS)~~ [coleenquadros,subbarao-meduri] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[coleenquadros]

/retest

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.

[sonarcloud[bot]]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[coleenquadros]

/retest

[coleenquadros]

/retest

[coleenquadros]

/retest

[saswatamcode]

/retest

[saswatamcode]

/retest

[coleenquadros]

/retest

[coleenquadros]

/test test-e2e

[coleenquadros]

/test test-e2e

[coleenquadros]

/cherrypick release-2.11

[coleenquadros]

/cherrypick release-2.10

[coleenquadros]

/cherrypick release-2.11

[openshift-cherrypick-robot]

@coleenquadros: new pull request created: #1640

In response to [this](https://github.com/stolostron/multicluster-observability-operator/pull/1637#issuecomment-2382729772): >/cherrypick release-2.11 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[coleenquadros]

/cherrypick release-2.10

[openshift-cherrypick-robot]

@coleenquadros: #1637 failed to apply on top of branch "release-2.10":

Applying: make sure local cluster is part of list all the time
Using index info to reconstruct a base tree...
M   operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go
M   operators/multiclusterobservability/controllers/placementrule/predicate_func.go
Falling back to patching base and 3-way merge...
Auto-merging operators/multiclusterobservability/controllers/placementrule/predicate_func.go
Auto-merging operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go
CONFLICT (content): Merge conflict in operators/multiclusterobservability/controllers/placementrule/placementrule_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 make sure local cluster is part of list all the time
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](https://github.com/stolostron/multicluster-observability-operator/pull/1637#issuecomment-2382743116): >/cherrypick release-2.10 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.