Add bullet-style dirty indicator for CTabFolder tabs #10465

Job	Run time
Event File	4s
Detect changed paths	3s
Build (macOS) (21, x86_64) / build	18m 45s
Build (macOS) (21, aarch64) / build	6m 9s
Build (Linux) (21, gtk3, x11) / build	7m 58s
Build (Linux) (21, gtk4, wayland) / build	11m 8s
Build (Linux) (21, gtk4, x11) / build	9m 30s
Build (Windows) (21) / build	12m 30s
	1h 6m 7s

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