Correct several small test description typos for the application builder.

(cherry picked from commit d512635)

Prior to this change, request errors were not handled correctly.

Closes #29884

(cherry picked from commit 156a14e)

…uring error compilation

Enhanced error handling to account for cases where `getOrCreateAngularServerApp` is undefined during the compilation process. This prevents unexpected crashes and improves build stability.

Closes #29907

(cherry picked from commit a8817a3)

When handling a request for a configured asset with the application-
based karma unit testing, the asset URL is now normalized to the
executing platform's path format before looking up the asset. This
is required due to the build file paths being based on the underlying
operating system's paths which may not align with a URL's path separator
such as when using Windows.

(cherry picked from commit bd917d9)

This fixes GHSA-x574-m823-4x7w

Closes #29936