[observability-pipelines-worker] 2.2.2 release

[neuronull]

What this PR does / why we need it:

Official release for OPW version 2.2.2

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Chart Version bumped
• [x] CHANGELOG.md has been updated
• [x] Variables are documented in the README.md