Add retry on getting ISSUER name

[danpawlik]

It happens on some infras that the issuer is empty. Probably it does not have enough time to apply changes.
This commit adds retry for getting the ISSUER name.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[softwarefactory-project-zuul]

Merge Failed.

This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset.
Warning:
Error merging github.com/openstack-k8s-operators/openstack-operator for 1462,4fa0cd8b373791b80423771b94ebc43926e1f568

[danpawlik]

2025-05-30 10:03:22.243628 | controller |     - === NAME  kuttl
2025-05-30 10:03:22.243632 | controller |     - '    harness.go:406: run tests finished'
2025-05-30 10:03:22.243637 | controller |     - '    harness.go:514: cleaning up'
2025-05-30 10:03:22.243641 | controller |     - '    harness.go:571: removing temp folder: ""'
2025-05-30 10:03:22.243646 | controller |     - '--- PASS: kuttl (899.50s)'
2025-05-30 10:03:22.243650 | controller |     - '    --- PASS: kuttl/harness (0.00s)'
2025-05-30 10:03:22.243655 | controller |     - '        --- PASS: kuttl/harness/ctlplane-tls-custom-issuers (897.73s)'

Finally \o/

[stuggi]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danpawlik, stuggi

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