Revert "fix(ivy): correct ngtsc path handling in Windows (#26703)"

This reverts commit d0037b22ef. The commit must be temporarily reverted because
there were unforeseen breakages in g3.

packages/compiler-cli/src/ngtsc/testing/BUILD.bazel

@@ -10,7 +10,6 @@ ts_library(
     ]),
     deps = [
         "//packages:types",
-        "@ngdeps//canonical-path",
         "@ngdeps//typescript",
     ],
 )

packages/compiler-cli/src/ngtsc/testing/in_memory_typescript.ts

@@ -8,7 +8,7 @@
 
 ///<reference types="jasmine"/>
 
-import * as path from 'canonical-path';
+import * as path from 'path';
 import * as ts from 'typescript';
 
 export function makeProgram(
@@ -93,7 +93,7 @@ export class InMemoryHost implements ts.CompilerHost {
   }
 
   getCanonicalFileName(fileName: string): string {
-    return path.normalize(`${this.getCurrentDirectory()}/${fileName}`);
+    return path.posix.normalize(`${this.getCurrentDirectory()}/${fileName}`);
   }
 
   useCaseSensitiveFileNames(): boolean { return true; }