Add option to all integrations to report incorrect formatting as a warning instead of error

[skoging]

Environments:

• CSharpier Version: 1.1.2
• Running CSharpier via: MsBuild
• Operating System: Windows 11
• .csharpierrc Settings: N/A
• .editorconfig Settings: N/A

Expected behavior:

> dotnet build -c release
...

Build succeeded.

/path/to/File.cs : warning : Was not formatted. [/path/to/Project.csproj]
    1 Warning(s)
    0 Error(s)

Time Elapsed 00:00:01.00

Actual behavior:

> dotnet build -c release
...

Build FAILED.

/path/to/File.cs : error : Was not formatted. [/path/to/Project.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.00

Related issue:

• ability to config that vscode extension shows warning instead of error. I don't prefer that formating stuff be an error #1405

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Feature request: Add option to control severity for csharpier check

There is already a similar option, but only for the VS Code extension.
I propose adding similar option to all integrations, either with common configuration in .csharpierrc and .editorconfig, or as a specific options for each integration similar to the VS Code integration.

[skoging]

A bonus would be to be able to configure this in a similar way as other formatter/analyzer diagnostics with a specific rule ID, but I'd consider this out of scope of this feature request.

dotnet_diagnostic.<rule ID>.severity = <severity value>