Optimize pod-refresh-on-external-config preprocessing and tests

[gazarenkov]

Description

This pull request:

• removes check for labels/annotations on hash calculation procedure avoiding extra creation of Deployment with checksum for "empty" config and -> unexpected additional Deployment update which should fix https://issues.redhat.com/browse/RHIDP-3217 (Backstage seems have the "concurrency" problem, starting up more than one instances)
• fixes config-refresh tests. Looks like newer Backstage version become more strict to the app-config content (it can not be "any" anymore)
• adds retry.RetryOnConflict for better experience (retrying with no error messages in log) when add extra labels/annotations on CM/Secret

Which issue(s) does this PR fix or relate to

https://issues.redhat.com/browse/RHIDP-3217

PR acceptance criteria

• Tests

How to test changes / Special notes to the reviewer

1. Run CR with specified CM/Secrets, no extra Pod should appear on start time, no extra "CM/Secret version conflict" Log records show up
2. integration_tests/config-refresh_test should pass.

[sonarcloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

PR images are available:

1. https://quay.io/janus-idp/operator:0.3.0-pr-414-a471f3f
2. https://quay.io/janus-idp/operator-bundle:0.3.0-pr-414-a471f3f
3. https://quay.io/janus-idp/operator-catalog:0.3.0-pr-414-a471f3f

[openshift-ci]

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