Remove moot fail-fast option

While it might not be possible to invalidate the cache by changing test.yml, this should speed things up a lot due to `bundle i` taking most of the time.

Remove `pull_request` event since it's not supported.

This reverts commit f93e58ed.

* Create release-drafter.yml
* Create release-notes.yml

The latest `actions/setup-node` prints this info by default

This is so that bundlewatch compares against v4-dev and not master.

* sinon 8.x doesn't work with IE, so leave it at 7.x.

Fix cache name

This is the official way of using Coveralls with Actions. Also this brings back Coveralls for PRs.

This way we match the Travis CI behavior, and it's inherited by all steps.

Without this, coveralls didn't receive the branch info thus leading to failures when we switched branches.

`version` is deprecated.

* Allow bundlesize to run for forks too.
* Add name for clone step.
* Add` fail-fast: false`