Use realpathSync.native on case-insensitive file systems (#44966)

* Make getSourceOfProjectReferenceRedirect take a Path

* Add useCaseSensitiveFileNames to ModuleResolutionHost

...so that path comparisons can use it during module resolution.

* Re-enable realpathSync.native for case-insensitive file systems

src/server/project.ts

@@ -1706,6 +1706,7 @@ namespace ts.server {
                     readFile: this.projectService.host.readFile.bind(this.projectService.host),
                     getDirectories: this.projectService.host.getDirectories.bind(this.projectService.host),
                     trace: this.projectService.host.trace?.bind(this.projectService.host),
+                    useCaseSensitiveFileNames: this.program.useCaseSensitiveFileNames(),
                 };
             }
             return this.projectService.host;