govet: add a warning about the deprecation of check-shadowing #4535
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It was "unofficially" deprecated since v1.19 (2019) (inside #697).
https://github.com/golangci/golangci-lint/pull/697/files#diff-5144159bbaf9571c0fb12b9077a23f5dd046eda75d10c4d02c8317d071b54019R124
I think it's time to add a warning to deprecate it.
The deprecation message is complex because there are several possible configurations:
check-shadowing
+enable-all
check-shadowing
+disable-all
check-shadowing
+enable
check-shadowing
+disable