feat(check): allow using side effect imports with unknown module kinds (ex. css modules) (#23392)

This allows people to use imports like:

```ts
import "./app.css";
```

...with `deno check` in systems where there's a bundle step (ex. Vite).
This will still error when using it with `deno run` or if the referenced
file does not exist.

See test cases for behaviour.

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/specs/check/css_import/__test__.jsonc b/tests/specs/check/css_import/__test__.jsonc
new file mode 100644
index 000000000..629dcd383
--- /dev/null
+++ b/tests/specs/check/css_import/__test__.jsonc
@@ -0,0 +1,24 @@
+{
+  "steps": [{
+    "args": "check exists.ts",
+    "output": "exists.out"
+  }, {
+    "args": "run --check exists.ts",
+    "output": "exists_run_with_check.out",
+    "exitCode": 1
+  }, {
+    "args": "check not_exists.ts",
+    "output": "not_exists.out",
+    "exitCode": 1
+  }, {
+    "args": "check exists_and_try_uses.ts",
+    "output": "exists_and_try_uses.out",
+    "exitCode": 1
+  }, {
+    "args": "check exists_dynamic_import.ts",
+    "output": "Check file:///[WILDCARD]exists_dynamic_import.ts\n"
+  }, {
+    "args": "run --check --reload exists_dynamic_import.ts",
+    "output": "Check file:///[WILDCARD]exists_dynamic_import.ts\n"
+  }]
+}