Allow to exclude rules via .editorconfig

[cmenzi]

Is your feature request related to a problem? Please describe.

Currently, when executing Sonar Analysis, it changes the active ruleset and inject the ruleset from the servers profile. It also possible to exclude/suppress some of the rules via attribute, NoWarn or additional ruleset file with some overridden values. But all settings from GlobalAnalyzerConfig or .editorconfig in a particular directory are not taken into account.

Describe the solution you'd like
Settings from GlobalAnalyzerConfig and the additional settings from the .editorconfigs inside a directory should also taken into account as rule configuration source.

This is anyway the new style on how to configure rules, because they provide more detailed options. Also Microsoft already moved ruleset to Legacy

Describe alternatives you've considered
Maybe use the GlobalAnalyzerConfig and .editorconfig and generate a legacy ruleset for sonarqube use the SourceGenerators to generate a GlobalSuppression file.

[pinkfloydx33]

It would be really great if the scanner didn't override everything completely and took .editorconfig into account. We have folks using VS, VS Code with/without Sonar Lint and we use the file to enforce warnings/style locally, not just for sonar. Maintaining the rule sets in two places, particularly when project specific is a bit unfortunate.

[martin-strecker-sonarsource]

After the change in SonarSource/sonar-dotnet#4724 hotspots rules can be disabled via editorconfig. But "normal" rules still report even if suppressed the same way as a hotspot. See this internal discuss thread for details. This inconsistent behavior should be fixed.

/cc @costin-zaharia-sonarsource @pavel-mikula-sonarsource @csaba-sagi-sonarsource

More details about "ruleset" files and "editorconfig"
dotnet/roslyn#53354
dotnet/roslyn#55920

Configuration files for code analysis rules - precedence

The precedence rules for conflicting severity entries from a ruleset file and an EditorConfig or global AnalyzerConfig file is undefined.