OCPBUGS-59626: operator/v1helpers: add namespaced secret/configmap getters

[vrutkovs]

Create new getters similar to CachedConfigMapGetter/CachedSecretGetter, but without a dependency on
a cluster-level informer. This allows the operator to continue functioning when etcd has a corrupted
key outside of target namespace. These new getters fall back to live client calls when a different
namespace is being requested.

Tested in openshift/cluster-kube-apiserver-operator#1916

[openshift-ci-robot]

@vrutkovs: This pull request references Jira Issue OCPBUGS-59626, which is invalid:

• expected the bug to target either version "4.21." or "openshift-4.21.", but it targets "4.20" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

Create new getters similar to CachedConfigMapGetter/CachedSecretGetter, but without a dependency on
a cluster-level informer. This allows the operator to continue functioning when etcd has a corrupted
key outside of target namespace. These new getters fall back to live client calls when a different
namespace is being requested.

Tested in openshift/cluster-kube-apiserver-operator#1916

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vrutkovs
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[openshift-ci]

@vrutkovs: all tests passed!

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[vrutkovs]

/jira refresh

[openshift-ci-robot]

@vrutkovs: This pull request references Jira Issue OCPBUGS-59626, which is valid.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.21.0) matches configured target version for branch (4.21.0)
• bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @gangwgr

In response to this:

/jira refresh

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