[Meta] FIPS docs: tracking, wrap up, and add more changes

[karenzone]

Original issues

• [FIPS] Collect user facing documentation notes ingest-docs#1735
• (fips): Document FIPS apm-server#15878

9.1.0

• Topic: FIPS mode for Ingest tools
• PRs:
  • FIPS for ingest tools #2136
  • Add details and links for FIPS ingest #2342

8.19.0

• Topic: FIPS mode for Ingest tools
• PR: Doc: FIPS for Ingest tools 8.19 ingest-docs#1833

New request

• Add more non-FIPS-compatible integrations #2367

Note to stakeholders

• If you have additional review comments, please add them to this issue in comments.

[simitt]

Thanks @karenzone for your work on this!