feat: add endpoint detection

[tepi]

Add check for if endpoint generator needs to run

Fixes #20289
Fixes #18800

[github-actions]

Test Results

1 159 files  ±0  1 159 suites  ±0   1h 32m 47s ⏱️ - 2m 37s
7 583 tests +2  7 527 ✅ +2  56 💤 ±0  0 ❌ ±0 
7 928 runs   - 5  7 865 ✅  - 3  63 💤  - 2  0 ❌ ±0 

Results for commit 281f16a. ± Comparison against base commit bcd7a0d.

This pull request removes 1 and adds 3 tests. Note that renamed tests count towards both.

com.vaadin.flow.server.frontend.NodeTasksHillaTest ‑ should_useHillaEngine_whenEnabled

com.vaadin.flow.server.frontend.NodeTasksHillaTest ‑ should_notUseHillaEngine_whenEndpointsAreNotDetected
com.vaadin.flow.server.frontend.NodeTasksHillaTest ‑ should_useHillaEngine_whenEndpointsAreDetected
com.vaadin.flow.server.frontend.NodeUpdaterTest ‑ getDefaultDependencies_endpointsAreUsed_addsHillaPackages

♻️ This comment has been updated with latest results.

[tepi]

For reviewers to test this:

1. You need local clones of flow, hilla and platform repos
2. For Flow checkout this branch, for Hilla checkout this branch, for Platform checkout main branch
3. Build flow: mvn clean install -DskipTests
4. Build hilla: npm run build , then mvn clean install -DskipTests
5. Build vaadin maven plugin: mvn clean install -DskipTests in platform/vaadin-maven-plugin
6. After that test with a project from start, using 24.6-SNAPSHOT as the vaadin version

[tepi]

@mshabarov When you have time could you check that it still works for your use case with the latest change?

[mshabarov]

Test manually with the following scenarios:

1. Vaadin app has only Java views and a ReactAdapter
2. Vaadin app has only TS view
3. Vaadin app has a TS view and a ReactAdapter.

Works as expected. LGTM.

[mshabarov]

⚠️ Let's not merge this until we get a green light from Hilla team for vaadin/hilla#2938.

[sonarqubecloud]

Quality Gate passed

Issues
20 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud