[stable35] fix(files): validate dropped filenames before upload #9694

Job	Run time
gate	7s
Playwright setup	2m 36s
Playwright tests for installer	8m 10s
Playwright tests 1 / 8	6m 43s
Playwright tests 6 / 8	7m 22s
Playwright tests 2 / 8	6m 37s
Playwright tests 3 / 8	8m 40s
Playwright tests 7 / 8	11m 47s
Playwright tests 8 / 8	7m 11s
Playwright tests 4 / 8	8m 41s
Playwright tests 5 / 8	9m 9s
merge-reports	36s
playwright-test-summary	6s
	1h 17m 45s

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