OCM-18657 | feat: Add external auth provider resource with validation

[gdbranco]

• Add comprehensive external auth provider resource structure
• Implement schema with full validation including HTTPS URLs, client secrets
• Add custom validation for client ID/secret combinations
• Create complete state structures following backend API model
• Add subsystem tests for validation scenarios
• Register resource in provider
• Implement placeholder CRUD operations (to be completed in OCM-18658)

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story (OCM-xxxx): Fixes #OCM-18657

Change type

• [x] New feature
• [ ] Bug fix
• [ ] Build
• [ ] CI
• [x] Documentation
• [ ] Performance
• [ ] Refactor
• [ ] Style
• [ ] Unit tests
• [x] Subsystem tests

Checklist

• [ ] Subject and description added to both, commit and PR.
• [ ] Relevant issues have been referenced.

[openshift-ci[bot]]

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[openshift-ci[bot]]

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[openshift-ci[bot]]

@gdbranco: The following tests 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/unit	a3a0bbe11fa5830309708c46c79c189892642c35	link	true	/test unit
ci/prow/e2e-presubmits-rosa-sts-private-critical-high-presubmit	a3a0bbe11fa5830309708c46c79c189892642c35	link	true	/test e2e-presubmits-rosa-sts-private-critical-high-presubmit
ci/prow/e2e-presubmits-rosa-hcp-advanced-critical-high-presubmit	a3a0bbe11fa5830309708c46c79c189892642c35	link	true	/test e2e-presubmits-rosa-hcp-advanced-critical-high-presubmit
ci/prow/e2e-presubmits-rosa-sts-advanced-critical-high-presubmit	a3a0bbe11fa5830309708c46c79c189892642c35	link	true	/test e2e-presubmits-rosa-sts-advanced-critical-high-presubmit
ci/prow/e2e-presubmits-rosa-hcp-private-critical-high-presubmit	a3a0bbe11fa5830309708c46c79c189892642c35	link	true	/test e2e-presubmits-rosa-hcp-private-critical-high-presubmit

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