feat(theme): add versions attribute to docsVersionDropdown navbar item

[hrumhurum]

Motivation

Fix #10833

The docsVersionDropdown navbar item supports a new versions attribute to filter/whitelist displayed versions. Only the provided versions will be displayed.

Example:

{
  type: 'docsVersionDropdown',
  versions: ['1.0.1', '2.1.1']
},

Also gives the ability to override version attributes (for now, only display label) by providing an object.

{
  type: 'docsVersionDropdown',
  versions: {
  '1.0.1': {label: '1.x'},
  '2.1.1': {label: '2.x'},
},

Test Plan

1. Go to the deploy preview website
2. Locate the docs version dropdown in the upper part of the website
3. Click on the dropdown
4. Notice how the version titles are customized
5. Notice how the list of versions are customized to display just a subset of versions
6. Visit Docusaurus documentation preview to take a look at the documentation for new functionality

Test links

Deploy preview: https://gp-temp-docusaurus-app1.netlify.app/eazfuscator.net

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	Report
/	🔴 44	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🔴 49	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 73	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 60	🟢 96	🟢 100	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🟠 65	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 63	🟢 96	🟢 100	🟠 86	Report
/blog/tags	🟠 73	🟢 100	🟢 100	🟠 86	Report

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[slorber]

The feature works thanks 👍

But I'd like a few things changed

[slorber]

Still think we shouldn't include the "version name/label shortcut" in this PR, and discuss it independently in another proposal.

Let me know if you can simplify your code, otherwise I'll do it