fix: client route collisions

[caalador]

Fix the client server route
collision to not take into
account client layouts as
they are not route targets.

For instance

  {
    "route": "flow",
    "params": {},
    "children": [
      {
        "route": "hello-hilla",
        "menu": {
          "title": "Hello React in Flow Layout"
        },
        "title": "Hilla in Flow",
        "flowLayout": true,
        "params": {}
      }
    ]
  },

Collision on flow is wrong as the actual existing route is only flow/hello-hilla and thus should not match against a server route flow

[github-actions]

Test Results

1 142 files  ± 0  1 142 suites  ±0   1h 24m 29s ⏱️ +53s
7 474 tests + 2  7 424 ✅ + 2  50 💤 ±0  0 ❌ ±0 
7 801 runs   - 30  7 741 ✅  - 30  60 💤 ±0  0 ❌ ±0 

Results for commit 2cf7e0e. ± Comparison against base commit abddf7b.

♻️ This comment has been updated with latest results.

[sonarqubecloud]

Quality Gate passed

Issues
22 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 SonarCloud

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.6.0.alpha2 and is also targeting the upcoming stable 24.6.0 version.