Severity is not being passed from golangci-lint into reviewdog

[algojack]

When we do --out-format line-number the word error, warning, etc doesn’t appear. So golangci-lint is not telling reviewdog the severity of any issues, and setting default severity: warning in the golangci-lint config doesn’t have any effect.

The work around is to use the “checkstyle” format. Which is an XML format supported by both reviewdog and golangci-lint that includes a severity=“XXX” field.

https://github.com/reviewdog/action-golangci-lint/blob/77873b3ad8215667886946b6f893580883f10d4f/src/main.ts#L63

[vinita-razor]

@algojack What should be the errorformat for "checkstyle" format