Drop the backward-compat gates on v2-dev and fix lint and bundlewatch

Remove check:compat and check:compat-fixture with their files and workflow
steps, since 2.0 breaks the 1.x API on purpose. Format the mixins test and
raise the tabler-props budget to 3.8 kB.

.github/workflows/build.yml

@@ -29,11 +29,3 @@ jobs:
       # turbo directly: `pnpm run build` also zips the package, which only the release needs
       - name: Build
         run: pnpm exec turbo build
-
-      # Nothing the last release shipped may disappear in a minor release. On the
-      # versions pull request it runs with --strict, but workflows there wait for
-      # a manual approval, so the Release workflow runs --strict too.
-      - name: Check backward compatibility
-        env:
-          STRICT: ${{ github.head_ref == 'changeset-release/dev' && '--strict' || '' }}
-        run: pnpm run check:compat $STRICT

.github/workflows/html-checks.yml

@@ -38,8 +38,3 @@ jobs:
 
       - name: Check markup classes
         run: pnpm run check:markup-classes --html preview/dist --html docs/dist --css preview/dist/dist/css --css preview/dist/dist/libs --css preview/dist/preview/css --css docs/dist/css --css docs/dist/preview/css
-
-      # A project written for the last release has to compile and behave the
-      # same on this build. Runs here because it needs the core build and a browser.
-      - name: Check a project written for the last release
-        run: pnpm run check:compat-fixture

.github/workflows/release.yml

@@ -35,15 +35,6 @@ jobs:
       - name: Build
         run: pnpm run build
 
-      # The last gate before npm: nothing the previous release shipped may be
-      # missing, unless compat-baseline.txt marks it as accepted. It runs here and
-      # not only on the versions pull request, because workflows on a pull request
-      # opened by the bot wait for a manual approval and may never run. On the
-      # push that publishes, the local version is not on npm yet, so the check
-      # compares with `latest`, which is the release users update from.
-      - name: Check backward compatibility
-        run: pnpm run check:compat --strict
-
       - name: Create release Pull Request or publish to NPM
         id: changesets
         uses: changesets/action@ae32849d5ba541f9ae29e40e22a623bc13562f51 # v2.1.2