feat: add cancellation support for file and source uploads #495

Job	Run time
sanitize-branch-name	2s
Detect Changes	9s
Build and Test Frontend	58s
Build and Test Libraries (rag-core-api)	2m 10s
Build and Test Libraries (admin-api-lib)	50s
Build and Test Libraries (extractor-api-lib)	6m 59s
Build and Test Libraries (rag-core-lib)	1m 29s
Validate Infrastructure	0s
Build and Test Services	0s
CI Summary	4s
	12m 41s

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