Handle more places where package direcroy is converted to canonical file path (#50740)

* Add test for node16 resolution with package json lookup making casing incorrect

* Handle more places where package direcroy is converted to canonical file path

src/compiler/program.ts

@@ -849,7 +849,7 @@ namespace ts {
 
     /*@internal*/
     export function getImpliedNodeFormatForFileWorker(
-        fileName: Path,
+        fileName: string,
         packageJsonInfoCache: PackageJsonInfoCache | undefined,
         host: ModuleResolutionHost,
         options: CompilerOptions,
@@ -870,7 +870,7 @@ namespace ts {
             state.failedLookupLocations = packageJsonLocations;
             state.affectingLocations = packageJsonLocations;
             const packageJsonScope = getPackageScopeForPath(fileName, state);
-            const impliedNodeFormat = packageJsonScope?.packageJsonContent.type === "module" ? ModuleKind.ESNext : ModuleKind.CommonJS;
+            const impliedNodeFormat = packageJsonScope?.contents.packageJsonContent.type === "module" ? ModuleKind.ESNext : ModuleKind.CommonJS;
             return { impliedNodeFormat, packageJsonLocations, packageJsonScope };
         }
     }
@@ -2834,7 +2834,7 @@ namespace ts {
             // It's a _little odd_ that we can't set `impliedNodeFormat` until the program step - but it's the first and only time we have a resolution cache
             // and a freshly made source file node on hand at the same time, and we need both to set the field. Persisting the resolution cache all the way
             // to the check and emit steps would be bad - so we much prefer detecting and storing the format information on the source file node upfront.
-            const result = getImpliedNodeFormatForFileWorker(toPath(fileName), moduleResolutionCache?.getPackageJsonInfoCache(), host, options);
+            const result = getImpliedNodeFormatForFileWorker(getNormalizedAbsolutePath(fileName, currentDirectory), moduleResolutionCache?.getPackageJsonInfoCache(), host, options);
             const languageVersion = getEmitScriptTarget(options);
             const setExternalModuleIndicator = getSetExternalModuleIndicator(options);
             return typeof result === "object" ?