Update to eclipse-temurin:21 and remove appuser (#4675) #1128

Job	Run time
cpp-lib-build (macos-12, clang, ON)	2m 57s
cpp-lib-build (macos-12, clang, OFF)	4m 10s
build (macos-12, tool)	1m 53s
cpp-lib-build (macos-12, gcc, ON)	3m 9s
build (macos-12, cpp)	18m 0s
cpp-lib-build (macos-12, gcc, OFF)	5m 19s
build (macos-12, csharp)	5m 14s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 4s
build (macos-12, dart)	4m 5s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 17s
build (macos-12, go)	4m 54s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 31s
build (macos-12, java)	4m 13s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 20s
build (macos-12, javascript)	2m 38s
cpp-lib-build (windows-2022, clang, ON)	4m 19s
build (macos-12, typescript)	11m 20s
cpp-lib-build (windows-2022, clang, OFF)	5m 24s
build (macos-12, php)	2m 28s
build (macos-12, python3)	2m 5s
cpp-lib-build (windows-2022, cl)	4m 19s
build (ubuntu-20.04, tool)	3m 26s
build (ubuntu-20.04, cpp)	17m 34s
build (ubuntu-20.04, csharp)	5m 31s
build (ubuntu-20.04, dart)	3m 57s
build (ubuntu-20.04, go)	2m 36s
build (ubuntu-20.04, java)	1m 37s
build (ubuntu-20.04, javascript)	1m 36s
build (ubuntu-20.04, typescript)	10m 9s
build (ubuntu-20.04, php)	1m 46s
build (ubuntu-20.04, python3)	1m 23s
build (windows-2022, tool)	1m 56s
build (windows-2022, cpp)	23m 37s
build (windows-2022, csharp)	7m 31s
build (windows-2022, dart)	4m 17s
build (windows-2022, go)	6m 11s
build (windows-2022, java)	4m 31s
build (windows-2022, javascript)	2m 37s
build (windows-2022, typescript)	20m 42s
build (windows-2022, php)	2m 33s
build (windows-2022, python3)	1m 43s
	3h 45m 52s

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