Add suppressor for IDE0058 on StringBuilder #1329

Job	Run time
compute_package_version	10s
build_and_test (ubuntu-latest, Release, roslyn3.8)	3m 2s
build_and_test (ubuntu-latest, Release, roslyn4.2)	2m 52s
build_and_test (ubuntu-latest, Release, roslyn4.4)	2m 58s
build_and_test (ubuntu-latest, Release, roslyn4.6)	2m 54s
build_and_test (ubuntu-latest, Release, roslyn4.8)	2m 58s
build_and_test (ubuntu-latest, Release, default)	2m 51s
build_and_test (windows-latest, Release, roslyn3.8)	6m 40s
build_and_test (windows-latest, Release, roslyn4.2)	7m 7s
build_and_test (windows-latest, Release, roslyn4.4)	6m 53s
build_and_test (windows-latest, Release, roslyn4.6)	7m 6s
build_and_test (windows-latest, Release, roslyn4.8)	7m 8s
build_and_test (windows-latest, Release, default)	7m 7s
create_nuget	2m 30s
validate_nuget	1m 1s
deploy	29s
create_release	0s
	1h 3m 46s

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