Add codefixer to convert a string to an interpolated string #1336

Job	Run time
build_and_test (ubuntu-latest, Release, roslyn3.8)	2m 54s
compute_package_version	2s
build_and_test (ubuntu-latest, Release, roslyn4.2)	3m 1s
build_and_test (ubuntu-latest, Release, roslyn4.4)	2m 59s
build_and_test (ubuntu-latest, Release, roslyn4.6)	2m 52s
build_and_test (ubuntu-latest, Release, roslyn4.8)	3m 8s
build_and_test (ubuntu-latest, Release, default)	2m 55s
build_and_test (windows-latest, Release, roslyn3.8)	7m 26s
build_and_test (windows-latest, Release, roslyn4.2)	7m 32s
build_and_test (windows-latest, Release, roslyn4.4)	7m 33s
build_and_test (windows-latest, Release, roslyn4.6)	7m 0s
build_and_test (windows-latest, Release, roslyn4.8)	7m 4s
build_and_test (windows-latest, Release, default)	7m 10s
create_nuget	2m 5s
validate_nuget	42s
deploy	24s
create_release	5s
	1h 4m 52s

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