[LOPS-2270] New Relic agent update release note.

[kporras07]

Closes #

Summary

New Relic PHP agent v10.22.0.12 now available - Adds release note for updated New Relic agent.

Remaining Work and Prerequisites

The following changes still need to be completed:

• [ ] Merge the actual agent update PRs.

Dependencies and Timing

• [ ] Other prerequisites that must be completed before merging this PR

Release:

• [ ] When ready
• [ ] After date: $DATE

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Post Launch

Do not remove - To be completed by the docs team upon merge:

• [ ] Redirect /old-path/ => /new-path/ (if applicable)
• [ ] Include/exclude pages ^ respectively within docs search service provider (if applicable)