Add codefixer to convert a string to an interpolated string #1335

Job	Run time
compute_package_version	23s
build_and_test (ubuntu-latest, Release, roslyn3.8)	2m 58s
build_and_test (ubuntu-latest, Release, roslyn4.2)	2m 55s
build_and_test (ubuntu-latest, Release, roslyn4.4)	3m 25s
build_and_test (ubuntu-latest, Release, roslyn4.6)	3m 0s
build_and_test (ubuntu-latest, Release, roslyn4.8)	2m 59s
build_and_test (ubuntu-latest, Release, default)	2m 47s
build_and_test (windows-latest, Release, roslyn3.8)	6m 29s
build_and_test (windows-latest, Release, roslyn4.2)	7m 39s
build_and_test (windows-latest, Release, roslyn4.4)	7m 15s
build_and_test (windows-latest, Release, roslyn4.6)	7m 5s
build_and_test (windows-latest, Release, roslyn4.8)	6m 18s
build_and_test (windows-latest, Release, default)	6m 42s
create_nuget	2m 14s
validate_nuget	1m 13s
deploy	0s
create_release	0s
	1h 3m 22s

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