chore: ignore agent scratch directories #594

Job	Run time
Release Smoke	1m 13s
Desktop Prime Packaged Smoke (win)	7m 17s
Test Server 2	2m 50s
Desktop Prime Packaged Smoke (linux)	3m 15s
Test Server 1	2m 46s
Test Server 3	3m 9s
Check	3m 5s
Prime Background Platform (ubuntu-24.04)	55s
Test	5m 39s
Rust	19s
	30m 28s

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