Follow Epic's logic for removing debug symbols

[uhlenbrock]

There are pdb files, not prefaced with UnrealEngine, which are expected to be present when creating a shipping build.

• C:\UnrealEngine\Engine\Binaries\Win64\tbb.pdb
• C:\UnrealEngine\Engine\Binaries\Win64\tbbmalloc.pdb

/cc @slonopotamus

[slonopotamus]

While this doesn't properly handle UE4 where things were called *UE4Editor*.pdb, I guess we can ignore that because the issue this is fixing only happens with UE-5.3+.

[adamrehn]

While performing testing for #359, I discovered that this change actually breaks 4.27 builds when not excluding debug symbols, hitting the following error:

 ---> c114ea905ab9
Step 29/34 : COPY --from=builder C:\UnrealEngine\Components\DebugSymbols C:\UnrealEngine
COPY failed: stat C:\UnrealEngine\Components\DebugSymbols: file does not exist

The new glob pattern doesn't match any PDB files at all under 4.27, so the DebugSymbols directory is empty. Evidently the COPY directive doesn't like merging an empty directory over an existing one, leading to the somewhat misleading error message shown above. Excluding debug symbols avoids this, but it doesn't actually reduce the image size, since all of the PDB files are left in their original locations and end up being copied into the final image stage. I've adjusted the glob pattern in commit 4e53548 to match both UE4Editor and UnrealEditor, and testing has confirmed that it works correctly for both Unreal Engine 4.27.2 and 5.3.2.