Add release notes for 2.12.0.0

[cwperks]

Description

Add release notes for 2.12.0.0 release

Category

Documentation

Issues Resolved

• [RELEASE] Release version 2.12.0 #1606

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4d7e5f3) 67.27% compared to head (8969c09) 67.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1772   +/-   ##
=======================================
  Coverage   67.27%   67.27%           
=======================================
  Files          94       94           
  Lines        2408     2408           
  Branches      320      320           
=======================================
  Hits         1620     1620           
  Misses        711      711           
  Partials       77       77           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[cwperks]

Looking into cypress test failure

[cwperks]

@peternied @DarshitChanpura I opened up a PR directly against the 2.12 branch while investigating the failure in the cypress test check.

[cwperks]

There may have been a recent change in the saved objects API: opensearch-project/OpenSearch-Dashboards#5777

  1) Saved objects table test
       "before all" hook for "should check the saved objects as global tenant":
     CypressError: `cy.request()` failed trying to load:

http://localhost:5601/api/saved_objects/index-pattern/index-pattern1

[DarshitChanpura]

I'm gonna squash and merge as the changes in this PR do not affect Cypress workflow in anyway.

[peternied]

I'm gonna squash and merge as the changes in this PR do not affect Cypress workflow in anyway.

@cwperks @DarshitChanpura Please create a follow up issue since a downstream change has broken our test cases

[derek-ho]

#1779

[derek-ho]

Doesn't seem like a problem with that API, I am also seeing other failures on other APIs, example: https://github.com/opensearch-project/dashboards-observability/actions/runs/7838604132/job/21390299850