Make thumbnail clear available for images/videos/pdfs #2308

Job	Run time
setup-matrix	3s
static-analysis (8.4, highest, 12.x-dev as 12.99.9, true) / Static analysis with phpstan	27s
static-analysis (8.3, lowest, false) / Static analysis with phpstan	18s
static-analysis (8.4, highest, false) / Static analysis with phpstan	24s
	1m 12s

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