Add suppressor for IDE0058 on StringBuilder #1328

Job	Run time
compute_package_version	4s
build_and_test (ubuntu-latest, Release, roslyn3.8)	2m 53s
build_and_test (ubuntu-latest, Release, roslyn4.2)	2m 57s
build_and_test (ubuntu-latest, Release, roslyn4.4)	3m 58s
build_and_test (ubuntu-latest, Release, roslyn4.6)	3m 59s
build_and_test (ubuntu-latest, Release, roslyn4.8)	2m 52s
build_and_test (ubuntu-latest, Release, default)	3m 55s
build_and_test (windows-latest, Release, roslyn3.8)	6m 40s
build_and_test (windows-latest, Release, roslyn4.2)	7m 34s
build_and_test (windows-latest, Release, roslyn4.4)	7m 8s
build_and_test (windows-latest, Release, roslyn4.6)	6m 55s
build_and_test (windows-latest, Release, roslyn4.8)	6m 53s
build_and_test (windows-latest, Release, default)	7m 6s
create_nuget	2m 9s
validate_nuget	46s
deploy	0s
create_release	0s
	1h 5m 49s

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