Remove legacy config options #2405

Job	Run time
pre_build	3m 40s
build_core_cli	1m 0s
build_core_and_testing	51s
build_code_fixes	56s
build_analyzers (analyzers, Analyzers, Analyzers)	58s
build_analyzers (formatting_analyzers, Formatting.Analyzers, FormattingAnalyzers)	1m 4s
build_framework_cli	1m 43s
build_refactorings	1m 0s
build_analyzers (code_analysis_analyzers, CodeAnalysis.Analyzers, CodeAnalysisAnalyzers)	52s
build_vs_extension	3m 8s
build_vs_code_extension	58s
publish_nuget_packages	0s
publish_cli_nuget_packages	0s
publish_ovsx_extension	0s
publish_vs_code_extension	0s
publish_vs_extension	0s
	16m 10s

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