Add workflow to update Objective-C API docs. Remove the Objective-C API doc generation step from the packaging pipeline.
There are similar workflows for automatically updating other language API docs. This change enables this for Objective-C too.
* Change storage container, simplify build definition parameters.
* Remove explicit version from Objective-C docs.
* Increase timeout.
* Use real storage account.
* Get static website URL with az cli.
Updates to the iOS packaging pipeline:
- Make it harder to overwrite package archives accidentally when uploading (fails if the archive already exists)
- Only upload package archives for release builds
- Some clean up