v20.0.0 teak release

[ahmed-arb]

v20.0.0 teak release

Epic: Teak Sandbox and Release Preparation

Todos before merge

• [x] Ensure changelog-entry exists for teak upgrade
• [x] Ensure changelog exists for v20
• [x] Ensure CI/Tests are working as expected
• [ ] Ensure teak branch is up-to-date with main (updated as of 20 Jun, 25)
• [ ] Ensure OPENEDX_COMMON_VERSION is pointing to correct tag release/teak.1

Merge Option

• [ ] Ensure "Merge Commit" option is used to merge the branch into release (Responsible: @DawoudSheraz/ @ahmed-arb ). This is needed to ensure the commit history when release is merged back into main

[Danyal-Faheem]

@ahmed-arb Can we rebase teak on top of main before the next sandbox reset?

There are quite a few missing commits