Importing DDS Cubemap with a resolution of 2048 takes 20 mins to import

Importing a DDS Cubemap with a resolution of 2048 takes approximately 20 mins to import into the engine. It will seemingly freeze the engine for the duration of the import.

Also reproduced in Promotable-CL-2469771

1. Open QAGame Editor
2. Import the Linked Cubemap Asset

RESULTS: Engine appears to freeze for approx. 20 mins. then finishes import of cubemap asset

EXPECTED: Engine should not be listed as Not Responding in Task Manager and it should not take 20 mins to import the texture

Fix UE-51650

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