archive(8.2) exclusion: physically remove files. Part 2, chonky boi.

[pepopowitz]

This PR currently targets the branch for #4641. That PR should at least be reviewed before merging this one, to keep it in a reviewable state.

This PR is also unlikely to ever be green, because there are so many changes that it breaks some of our CI checks.

Description

Part of #4527.

Physically removes the 8.2/3.10.0 content from the docs. This is the final step in archiving this unsupported version.

Since it's hard to view in the browser, these are the commands I ran for this PR:

rm -rf ./versioned_docs/version-8.2/
rm ./versioned_sidebars/version-8.2-sidebars.json
rm -rf ./optimize_versioned_docs/version-3.10.0/
rm ./optimize_versioned_sidebars/version-3.10.0-sidebars.json

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, and I've assigned @camunda/tech-writers as a reviewer.

[akeller]

Turns out a new computer helps me review these massive changes! Sidebars and versioned docs directories appear to be as I expect them and the PR is all deletions. ✅

The base branch was changed.