ci: enable merge queue on the v-next branch

[galargh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

---

This PR adds aggregation jobs for the ci matrix jobs and lint matrix jobs on the v-next branch. This is a prerequisite to enabling required checks on the v-next branch, which in itself is a prerequisite to enabling merge queue.

TODO (after the merge):

1. Create v-next protection rule set (assuming we don't have existing rule set nor branch protection rule yet)
   1. Go to https://github.com/NomicFoundation/hardhat/settings/rules/new?target=branch&enforcement=disabled
   2. Set the Ruleset Name
   3. Change the Enforcement status to Active
   4. Scroll to Targets > Target branches
   5. Add target > Include pattern > v-next > Add Inclusion pattern
   6. Scroll to Rules > Branch rules
   7. Check Require merge queue
   8. Check Require a pull request before merging (?)
   9. Check Require status checks to pass
      1. Add check > ci
      2. Add check > lint

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 13, 2024 5:40pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: e460231

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[alcuadrado]

Nice! This is way simpler than what I expected. I'll merge it so that I can add the settings to the repo.

[alcuadrado]

It should be enabled now