Automatic merge from submit-queue (batch tested with PRs 36721, 46483, 45500, 46724, 46036)
Federation: Minor corrections in service controller and add a unit testcase
**What this PR does / why we need it**:
This PR fixes few outdated comments in federation service controller and few other minor fixes.
This also adds a unit test case to test federated service deletion.
/assign @quinton-hoole
/cc @marun @kubernetes/sig-federation-pr-reviews
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 46450, 46272, 46453, 46019, 46367)
Add ClusterSelector to Ingress Controller
This pull request adds ClusterSelector to the Federated Ingress Controller ref: design #29887
This back ports the same functionality from the sync controller (merged pull #40234) in order to make this feature available across all Controllers for the 1.7 release.
cc: @kubernetes/sig-federation-pr-reviews @shashidharatd
**Release note**:
```
The annotation `federation.alpha.kubernetes.io/cluster-selector` can be used with Ingress objects to target federated clusters by label.
```
fix test error formatting
updates from comments
update gofmt
simplify tests
add to new sync controller
add tests
remove configmap changes due to rebase
updates from review
refactor tests to be based on operations
improvements from review
updates from rebase
rebase to #45374
updates from review
refactor SendToCluster for tests
fix import order
rebase to upstream
Automatic merge from submit-queue
Remove GetClientsetForCluster()
The newClusterClientset() has insteaded of GetClientsetForCluster(),
and GetClientsetForCluster() run wrong. Let's remove it.
Automatic merge from submit-queue
Ignore IsNotFound error
IsNotFound error is fine since that means the object is
deleted already, so we should check err and ignore err
before returning.
Automatic merge from submit-queue (batch tested with PRs 44942, 41258)
[Federation] Use federated informer for service controller and annotations to store lb ingress
**What this PR does / why we need it**:
This is breaking up of the PR #40296 into smaller one. please refer to #41253
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Handles 2 tasks in #41253
Fixes issues in #27623, #35827
**Special notes for your reviewer**:
**Release note**:
```
NONE
```
cc @quinton-hoole @nikhiljindal @kubernetes/sig-federation-pr-reviews
The unit test for the ingress controller was previously adding
a cluster twice, which resulted in a cluster being deleted and added
back. The deletion was racing the controller shutdown to close
informer channels. This change ensures that the informer clears its
map of informers when Stop() is called to prevent a double close, and
that the test no longer adds the cluster twice.
