feat: Support updates to previous major versions

[mdjermanovic]

Refs eslint/eslint#18691

Adds support for releasing new versions of previous major lines.

• Code that calculates changelog will use the latest version tag of those that point to the history of the current branch only. That should ensure that the changelog and the version to be released are correctly calculated.
• generateRelease() will have an optional parameter packageTag. When releasing, for example, v8.57.1 (the current latest version is v9.9.1), eslint's Makefile.js will pass "maintenance". This tag will be used as --tag for npm publish. This tag will also be used to determine whether GitHub should mark the GitHub release as Latest.

Marked as a draft to do some testing first.

[sam3k]

Per our formal EOL, we should aim to do this release by 2024-10-05 for v8.x.

In the 09-05-2024 tsc-meeting, we agreed to the following action items:

• @nzakas is going to do a blog post next week announcing this release and mention the formal version support policy that we have posted.
• HeroDevs will coordinate a blog post on their end as well.
• @mdjermanovic will port the PR for Makefile.js in eslint/eslint to v8.x-dev and do an early release as soon as we feel confident it's ready for release

[mdjermanovic]

This is ready for review. It's meant to work with eslint/eslint#18870 and eslint/eslint#18871.

Although these changes should be backwards compatible, it might be safer to release this after we determine that there's no need for a follow-up release for eslint v9.10.0 (i.e., when we close eslint/eslint#18819).

[nzakas]

Code LGTM. Could you add some docs to the README about how a prerelease works vs a regular release?

[mdjermanovic]

I've updated README and added API section for this package. Docs on how we're specifically releasing ESLint using this package are added in eslint/eslint#18871.

[nzakas]

LGTM. Would like @fasttime to verify his feedback before merging.

[fasttime]

LGTM, thanks!