Changelog for 2.12.

[dlvenable]

Description

The changelog for Data Prepper 2.12

git fetch upstream
git switch 2.12
git fetch upstream --tags
git pull
git-release-notes 2.11.0..HEAD markdown > release/release-notes/data-prepper.change-log-2.12.0.md
git switch main

Issues Resolved

N/A

Check List

• New functionality includes testing.
• New functionality has a documentation issue. Please link to it in this PR.
  • New functionality has javadoc added
• Commits are signed with a real name per the DCO

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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