Remove certificate-authority-data if HC has named certs

[philipwu08]

Description of the change(s):

• Remove certificate-authority-data from the admin-kubeconfig on the hub if the hosted cluster has serving certificates.

Why do we need this PR:

• Workaround issue where the serving certificate is replaced by a generated self-signed cert.

Issue reference:

• https://issues.redhat.com/browse/ACM-3990

Test API/Unit - Success

ok  	github.com/stolostron/hypershift-addon-operator/pkg/agent	19.640s	coverage: 72.5% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/install	280.989s	coverage: 87.0% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/manager	1.114s	coverage: 55.8% of statements
ok  	github.com/stolostron/hypershift-addon-operator/pkg/metrics	0.584s	coverage: 100.0% of statements

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: philipwu08

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

78.3% Coverage
0.0% Duplication

[openshift-merge-robot]

PR needs rebase.

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