Add what's new content for mamba and micromamba magic

Revert "fix semicolon detection with no history"

Support completion based on type annotations of calls (#14185) This fixes #14184 when `%config IPCompleter.use_jedi=False` is used: 

Implement magic for mamba and micromamba (#14191) Conda has two compatible alternative that are mamba and micromamba. In order for users to be able to use conda environment based on these two drop-in alternative, this patch implements two additional magic commands that makes them usable in the same fashion as conda. Fixes #14075

Update release script to use git switch in place of checkout (#14189) Git checkout has been deprecated in favor of git switch. The switch sub command is dedicated to branch handling while checkout did several different unrelated things which made it error prone. Fixes #13910

Fix temporary folder cleanup on exit (#14188) When using mkdtemp, the folder content cleanup must be done by the user. The current call to `rmdir` fails in case additional files are generated while editing the code. For example vim with undofile activated does this. Fixes #14099

Deprecation and removal for 8.17 (#14187) See #14186 I think for each of those warning we should: 1) Open an issue for removal, and update the corresponding warnings text to point to the corresponding issue.

Fix a typo in a comment

Implement magic for mamba and micromamba

Update release script to use git switch in place of checkout