test(run): smoke-test running and testing each language's fixture (#1332)

* test(run): smoke-test running and testing each language's fixture

smoke/run.test.ts drives the frontend's run store against a real
openidea-server for TypeScript, Python, Rust, Go, Java and Kotlin: the
detected configurations, a run to its output, the tests with the
fixture's failing test switched on (counts, failure name, location and
message in the test tree), and Rerun Failed Tests running only that test.

`pnpm smoke` runs it; the Language smoke workflow runs it per language
after the code intelligence smoke.

* ci(language-smoke): let main's runs finish

Merges to main came faster than a run, so each one cancelled the run
before it: main never finished the smoke nor saved the build cache PRs
restore. Only a PR's runs are superseded now.

.github/workflows/language-smoke.yml

@@ -2,6 +2,8 @@ name: Language smoke
 # Everyday code intelligence (completion, go to definition, Find Usages, hover, diagnostics
 # with a quick fix, an intention, formatting, rename) per language, against the language
 # server the app starts by default: crates/ide-host/tests/language_smoke.rs.
+# Then running and testing each fixture through the run store and openidea-server
+# (Run, Run tests, the test tree, Rerun Failed Tests): smoke/run.test.ts.
 on:
   push:
     branches: [main]
@@ -14,12 +16,18 @@ on:
       - "fixtures/**"
       - "Cargo.toml"
       - "Cargo.lock"
+      - "src/features/run/**"
+      - "src/platform/**"
+      - "smoke/**"
+      - "package.json"
+      - "pnpm-lock.yaml"
       - ".github/workflows/language-smoke.yml"
   workflow_dispatch:
 
 concurrency:
   group: language-smoke-${{ github.ref }}
-  cancel-in-progress: true
+  # A new push supersedes a PR's run; on main every merge runs to the end (and saves the cache).
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 env:
   CARGO_TERM_COLOR: always
@@ -53,9 +61,10 @@ jobs:
           shared-key: language-smoke
           save-if: ${{ github.ref == 'refs/heads/main' && matrix.language == 'rust' }}
 
-      - if: matrix.language == 'typescript'
-        uses: actions/setup-node@v4
-        with: { node-version: 22 }
+      - uses: pnpm/action-setup@v4
+        with: { version: 11 }
+      - uses: actions/setup-node@v4
+        with: { node-version: 22, cache: pnpm }
       - if: matrix.language == 'typescript'
         run: npm install --global "@vtsls/language-server@$VTSLS" "typescript@$TYPESCRIPT"
 
@@ -95,3 +104,7 @@ jobs:
 
       - run: cargo test --locked -p ide-host --test language_smoke --no-run
       - run: cargo test --locked -p ide-host --test language_smoke -- --ignored --exact ${{ matrix.language }}
+
+      - run: pnpm install --frozen-lockfile
+      - run: cargo build --locked -p ide-host --bin openidea-server
+      - run: pnpm smoke smoke/run.test.ts -t "^${{ matrix.language }}$"