Add v2.12.0 Release Notes (#1092) #2779

Job	Run time
test-and-build-windows-macos (11, windows-latest, ism)	5m 2s
test-and-build-windows-macos (11, windows-latest, non-ism)	4m 4s
test-and-build-windows-macos (11, macos-latest, ism)	4m 2s
test-and-build-windows-macos (11, macos-latest, non-ism)	4m 53s
test-and-build-windows-macos (17, windows-latest, ism)	4m 11s
test-and-build-windows-macos (17, windows-latest, non-ism)	4m 1s
test-and-build-windows-macos (17, macos-latest, ism)	6m 34s
test-and-build-windows-macos (17, macos-latest, non-ism)	6m 24s
test-and-build-windows-macos (21, windows-latest, ism)	4m 6s
test-and-build-windows-macos (21, windows-latest, non-ism)	3m 59s
test-and-build-windows-macos (21, macos-latest, ism)	9m 34s
test-and-build-windows-macos (21, macos-latest, non-ism)	7m 50s
Get-CI-Image-Tag / Get-CI-Image-Tag	3s
test-and-build-linux (11, ism)	24m 0s
test-and-build-linux (11, non-ism)	12m 44s
test-and-build-linux (17, ism)	23m 43s
test-and-build-linux (17, non-ism)	13m 29s
test-and-build-linux (21, ism)	23m 45s
test-and-build-linux (21, non-ism)	13m 13s
	2h 55m 37s

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