drop OCP 4.15 from PARTNERS.md

[tareqalayan]

dropping support for OCP 4.15 per
https://access.redhat.com/support/policy/updates/openshift

Why the changes were made

How to test the changes made

[coderabbitai]

Walkthrough

Removed the OpenShift 4.15 row from the "Current and Planned Supported Versions" table in PARTNERS.md. This is a documentation-only change with no impact on code or logic.

Changes

Cohort / File(s)	Summary
Documentation Update PARTNERS.md	Removed OpenShift 4.15 row from the "Current and Planned Supported Versions" table.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai, tareqalayan, weshayutin

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