Add solid-router to vite-ecosystem-ci

[birkskyum]

This add the solid-router test suite to the vite-ecosystem-ci.

It introduces to the vite-ecosystem-ci some amount of coverage for both @solidjs/router and vite-plugin-solid.
It doesn't cover the solid-start repo / vinxi repo, which currently handles the file-based routing and nitro integration.

The terminal output from this suite is:

 ✓ test/utils.spec.ts  (71 tests) 12ms
 ✓ test/route.spec.ts  (28 tests) 9ms
 ✓ test/integration.spec.ts  (7 tests) 7ms
 ✓ test/router.spec.ts  (24 tests) 75ms

 Test Files  5 passed (5)
      Tests  131 passed (131)
   Start at  18:40:31
   Duration  1.16s (transform 449ms, setup 0ms, collect 1.12s, tests 105ms, environment 1.88s, prepare 339ms)

[dominikg]

Thank you for this. I have some questions regarding coverage of vite code in this PR. Skimming the tests in the solid router repo it looks like unit tests mostly, where vite is not being called at all. For vite-ecosystem-ci to be efficient, we would like to have test suites that include calls to vite api, eg e2e tests running vite dev or vite build with a framework plugin or code that calls vites directly exported api.

Unrelated tests that are not influenced by the local vite version should be excluded, eg by creating a separate test:vite-ecosystem-ci script that filters your tests for these.

[patak-cat]

Discussed with @birkskyum about this PR, and we decided to close it and add later on Solid Start once they are ready.