Prepare release 2.9.0

[0xnm]

What does this PR do?

This PR prepares SDK release version 2.9.0.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.63%. Comparing base (c0eb3d8) to head (c0eb3d8).

:exclamation: Current head c0eb3d8 differs from pull request most recent head 6578a3c. Consider uploading reports for the commit 6578a3c to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/2.9.0 #2019 +/- ## ============================================== Coverage 83.63% 83.63% ============================================== Files 488 488 Lines 17781 17781 Branches 2667 2667 ============================================== Hits 14870 14870 Misses 2181 2181 Partials 730 730 ```