Release 9.12.0

[kaylareopelle]

Includes recent changes as well as CSEC agent features

Try to merge the following docs-related PRs before release.

• [X] #2753 (skipping for now in lieu of #2772)
• [x] #2755
• [x] #2768
• [x] #2770

[workato-integration[bot]]

https://new-relic.atlassian.net/browse/NR-294358