OCPNODE-4520: Update enhancement for 5.0 GA target

[saschagrunert]

Update the additional storage configuration enhancement to reflect
the current implementation state and 5.0 GA target.

• Update status from provisional to implementable
• Align API types with shipped API (StorePath type, correct struct hierarchy)
• Document MCO :ref suffix auto-append behavior
• Check off completed TP and GA prerequisite items (feature gate, API review, MCO, CRI-O v1.36, docs, test coverage, security review, RHOAI, field feedback, migration path)
• Pin GA target to 5.0, add upgrade/downgrade paths
• Strengthen experimental API risk documentation
• Add implementation references and related JIRA issues

cc @haircommander @QiWang19 @sairameshv @harche @bitoku @yuqi-zhang

API PR: openshift/api#2858

[openshift-ci-robot]

@saschagrunert: This pull request references OCPNODE-4520 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Update the additional storage configuration enhancement to reflect
the current implementation state and 5.0 GA target.

• Update status from provisional to implementable
• Add 5.0 GA goal (promote AdditionalStorageConfig to Default)
• Update API types to match shipped API (shared StorePath type,
  consecutive slash validation)
• Document MCO :ref suffix auto-append behavior
• Check off completed TP checklist items (feature gate, API review,
  MCO implementation, CRI-O v1.36)
• Pin GA target from 4.23+ to 5.0
• Add GA upgrade path (4.22 to 5.0)
• Strengthen experimental API risk documentation

cc @haircommander @QiWang19 @sairameshv @harche @bitoku @yuqi-zhang

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[openshift-ci]

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[openshift-ci]

@saschagrunert: all tests passed!

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[haircommander]

LGTM