Explicitly ignore unused var in TypeScript and @typescript-eslint #1140

Job	Run time
cpp-lib-build (macos-12, clang, ON)	50s
cpp-lib-build (macos-12, clang, OFF)	57s
build (macos-12, tool)	1m 45s
cpp-lib-build (macos-12, gcc, ON)	56s
build (macos-12, cpp)	16m 55s
cpp-lib-build (macos-12, gcc, OFF)	1m 9s
build (macos-12, csharp)	5m 12s
cpp-lib-build (ubuntu-20.04, clang, ON)	57s
build (macos-12, dart)	3m 38s
cpp-lib-build (ubuntu-20.04, clang, OFF)	1m 3s
build (macos-12, go)	2m 58s
cpp-lib-build (ubuntu-20.04, gcc, ON)	40s
build (macos-12, java)	2m 19s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	53s
build (macos-12, javascript)	1m 51s
build (macos-12, typescript)	12m 34s
cpp-lib-build (windows-2022, clang, ON)	4m 21s
build (macos-12, php)	14m 7s
cpp-lib-build (windows-2022, clang, OFF)	5m 38s
build (macos-12, python3)	2m 11s
cpp-lib-build (windows-2022, cl)	4m 15s
build (ubuntu-20.04, tool)	1m 0s
build (ubuntu-20.04, cpp)	15m 32s
build (ubuntu-20.04, csharp)	5m 14s
build (ubuntu-20.04, dart)	3m 52s
build (ubuntu-20.04, go)	2m 26s
build (ubuntu-20.04, java)	1m 6s
build (ubuntu-20.04, javascript)	1m 22s
build (ubuntu-20.04, typescript)	10m 3s
build (ubuntu-20.04, php)	1m 51s
build (ubuntu-20.04, python3)	1m 18s
build (windows-2022, tool)	1m 43s
build (windows-2022, cpp)	23m 2s
build (windows-2022, csharp)	7m 33s
build (windows-2022, dart)	4m 8s
build (windows-2022, go)	5m 29s
build (windows-2022, java)	2m 1s
build (windows-2022, javascript)	2m 3s
build (windows-2022, typescript)	20m 45s
build (windows-2022, php)	2m 13s
build (windows-2022, python3)	1m 44s
	3h 19m 34s

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