Refactor file icons to use `IconTheme` (#23153) #39904

Job	Run time
check_docs_only	19s
Check Postgres and Protobuf migrations, mergability	13s
Check formatting and spelling	34s
(Linux) Build Remote Server	3s
(Windows) Run Clippy and tests	6s
(macOS) Run Clippy and tests	7s
(Linux) Run Clippy and tests	2s
Create a macOS bundle	0s
Create arm64 Linux bundle	0s
Create a Linux bundle	0s
Auto release preview	0s
	1m 24s

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