Add release note categorization

Reformat release notes

build: v3.32.0 release (projectcalico#12648)

* build: v3.32.0 release
* Use SEMAPHORE_GIT_BRANCH only if it's release or master
* Add operator branch to release/release publish
* Create temp directory when we start up
* Enhance release note parsing
* Regenerate release notes
* Add headline features

Add release notes for v3.31.5

Begin development for v3.33.0

Move release note to bug fixes

Set locale explicitly for consistent sorting

Fix release note for projectcalico#11574

style: formatting issues

Add release notes for v3.30.5