monitoring update to 91.4.1-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/monitoring/-/blob/91.4.1-bb.1/CHANGELOG.md

Validation: 11 focused unit tests and Helm lint passed. Exact-head pipeline 5657036 and its downstream pipeline passed all four deployment lanes: clean install, upgrade, OCI, and ambient.

Package MR

big-bang/product/packages/monitoring!523 (merged)

For Issue

Closes: big-bang/product/packages/monitoring#402 (closed)

Upgrade Notices

N/A

This includes the test-only datasource lookup fix from Monitoring !523 (merged) and the kubelet TLS integration fix from umbrella !8283 (merged).