[PM-2718] Set nspasteboard.ConcealedType for clipboard on MacOS #26721

Job	Run time
Verify Electron Version	5s
Setup	6s
Windows Build	14m 51s
Linux Build	9m 45s
MacOS Build	11m 54s
Browser Build / Setup	4s
Browser Build / Locales Test	6s
Browser Build / Build	7m 16s
Browser Build / Build Safari	8m 18s
Browser Build / Crowdin Push	0s
Browser Build / Check for failures	31s
MacOS Package GitHub Release Assets	11m 57s
MacOS Package Dev Release Asset	6m 55s
MacOS Package Prod Release Asset	10m 47s
Crowdin Push	0s
Check for failures	32s
	1h 23m 7s

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