Add controller to watch external-kubeconfig-secret

[philipwu08]

Description of the change(s):

• Add a controller to watch the external-managed-kubeconfig secret for deletion. If it is deleted, add an annotation to the HC to trigger a reconcile of the HC, which would recreate the secret.

Why do we need this PR:

• If the external-managed-kubeconfig is deleted today, it requires manual steps by the user to recreate it.

Issue reference:

• https://issues.redhat.com/browse/ACM-2093

Test API/Unit - Success

ok  	github.com/stolostron/hypershift-addon-operator/pkg/agent	19.835s	coverage: 71.3% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/install	277.243s	coverage: 87.0% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/manager	1.871s	coverage: 56.2% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/metrics	0.609s	coverage: 100.0% of statements

Signed-off-by: Philip Wu [email protected]

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: philipwu08

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[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
4 Code Smells

55.6% Coverage
0.0% Duplication

[openshift-ci]

@philipwu08: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/sonar	5998f72	link	true	/test sonar

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[openshift-merge-robot]

PR needs rebase.

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