Only execute miri on the salsa-2022 packages

These don't need to disable isolation so the `-Zmiri-isolation-error` flag can be removed.

.github/workflows/test.yml

@@ -68,7 +68,6 @@ jobs:
     name: "Miri"
     runs-on: ubuntu-latest
     env:
-      MIRIFLAGS: "-Zmiri-isolation-error=warn"
     steps:
       - uses: actions/checkout@v3
       - name: Install Miri
@@ -77,4 +76,4 @@ jobs:
           rustup override set nightly
           cargo miri setup
       - name: Test with Miri
-        run: cargo miri test --no-fail-fast
+        run: cargo miri test --no-fail-fast -p salsa-2022 -p salsa-2022-tests -p calc -p lazy-input