Add v2.12.0 Release Notes (#1092) #2781

Job	Run time
test-and-build-windows-macos (11, windows-latest, ism)	4m 3s
test-and-build-windows-macos (11, windows-latest, non-ism)	4m 1s
test-and-build-windows-macos (11, macos-latest, ism)	6m 40s
test-and-build-windows-macos (11, macos-latest, non-ism)	7m 57s
test-and-build-windows-macos (17, windows-latest, ism)	4m 5s
test-and-build-windows-macos (17, windows-latest, non-ism)	4m 4s
test-and-build-windows-macos (17, macos-latest, ism)	5m 48s
test-and-build-windows-macos (17, macos-latest, non-ism)	5m 17s
test-and-build-windows-macos (21, windows-latest, ism)	4m 1s
test-and-build-windows-macos (21, windows-latest, non-ism)	4m 1s
test-and-build-windows-macos (21, macos-latest, ism)	11m 13s
test-and-build-windows-macos (21, macos-latest, non-ism)	4m 29s
Get-CI-Image-Tag / Get-CI-Image-Tag	5s
test-and-build-linux (11, ism)	23m 46s
test-and-build-linux (11, non-ism)	13m 42s
test-and-build-linux (17, ism)	23m 47s
test-and-build-linux (17, non-ism)	13m 21s
test-and-build-linux (21, ism)	23m 39s
test-and-build-linux (21, non-ism)	13m 14s
	2h 57m 13s

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