docs: version selectors synchronization

[mdjermanovic]

This intentionally targets the v8.x branch.

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[x] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

Ports #18260 to v8.x.

What changes did you make? (Give an overview)

Copied docs/ changes from #18260.

Build-related changes are intentionally omitted as they're not important for this branch.

The following code is also intentionally omitted as it was necessary only for testing of #18260 (I'll remove it from the main branch as well):

eslint/docs/src/_data/eslintVersions.js

Lines 31 to 35 in 96607d0

	// For initial commit purpose only
	if (items.length === 0) {
	const localData = require("./versions.json");
	items.push(...localData.items);
	}

The same for docs/src/_data/versions.json.

Is there anything you'd like reviewers to focus on?

If we'll release another prerelease this week, I'll manually sync the latest branch with the v8.x branch when this is merged. - edit: no need for updating the latest branch manually as we're releasing v9.0.0 final and the latest branch will be synced with the main branch where this has already been implemented.

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[nzakas]

LGTM. Just leaving open so @mdjermanovic can merge when ready.

[mdjermanovic]

Safe to merge now, and we'll need this to test eslint/eslint.org#541.