test: fix several Bazel compiler tests in windows (#30146)

```
//packages/compiler-cli/test:ngc
//packages/compiler/test:test
```

This also address `node_modules` to the ignored paths for ngc compiler as otherwise the `ready` is never fired

Partially addresses #29785

PR Close #30146

packages/compiler-cli/test/ngc_spec.ts

@@ -2028,11 +2028,13 @@ describe('ngc transformer command-line', () => {
       const exitCode =
           main(['-p', path.join(basePath, 'src/tsconfig.json')], message => messages.push(message));
       expect(exitCode).toBe(1, 'Compile was expected to fail');
+      const srcPathWithSep = `lib${path.sep}`;
       expect(messages[0])
-          .toEqual(`lib/test.component.ts(6,21): Error during template compile of 'TestComponent'
+          .toEqual(
+              `${srcPathWithSep}test.component.ts(6,21): Error during template compile of 'TestComponent'
   Tagged template expressions are not supported in metadata in 't1'
-    't1' references 't2' at lib/indirect1.ts(3,27)
-      't2' contains the error at lib/indirect2.ts(4,27).
+    't1' references 't2' at ${srcPathWithSep}indirect1.ts(3,27)
+      't2' contains the error at ${srcPathWithSep}indirect2.ts(4,27).
 `);
     });
   });

packages/compiler-cli/test/test_support.ts

@@ -19,7 +19,7 @@ export function makeTempDir(): string {
   let dir: string;
   while (true) {
     const id = (Math.random() * 1000000).toFixed(0);
-    dir = path.join(tmpdir, `tmp.${id}`);
+    dir = path.posix.join(tmpdir, `tmp.${id}`);
     if (!fs.existsSync(dir)) break;
   }
   fs.mkdirSync(dir);