fix: filter invalid issues before other processors

[ldez]

Before:

$ golangci-lint run 
WARN [runner] Can't process result by autogenerated_exclude processor: can't filter issue result.Issue{FromLinter:"contextcheck", Text:"Function `NewWriteLock$1` should pass the context parameter", Severity:"", SourceLines:[]string(nil), Replacement:(*result.Replacement)(nil), Pkg:(*packages.Package)(0xc00012c480), LineRange:(*result.Range)(nil), Pos:token.Position{Filename:"", Offset:0, Line:0, Column:0}, HunkPos:0, ExpectNoLint:false, ExpectedNoLintLinter:""}: no file path for issue 
WARN [runner] Can't process result by nolint processor: can't filter issue result.Issue{FromLinter:"contextcheck", Text:"Function `NewWriteLock$1` should pass the context parameter", Severity:"", SourceLines:[]string(nil), Replacement:(*result.Replacement)(nil), Pkg:(*packages.Package)(0xc00012c480), LineRange:(*result.Range)(nil), Pos:token.Position{Filename:"", Offset:0, Line:0, Column:0}, HunkPos:0, ExpectNoLint:false, ExpectedNoLintLinter:""}: no file path for issue 
WARN [runner/source_code] Failed to get line 0 for file : failed to get file  lines cache: can't get file  bytes from cache: can't read file : open : no such file or directory 
:0: Function `NewWriteLock$1` should pass the context parameter (contextcheck)

With this PR:

$ ./golangci-lint run
WARN [runner/invalid_issue] no file path for the issue: probably a bug inside the linter "contextcheck": &result.Issue{FromLinter:"contextcheck", Text:"Function `NewWriteLock$1` should pass the context parameter", Severity:"", SourceLines:[]string(nil), Replacement:(*result.Replacement)(nil), Pkg:(*packages.Package)(0xc000be4480), LineRange:(*result.Range)(nil), Pos:token.Position{Filename:"", Offset:0, Line:0, Column:0}, HunkPos:0, ExpectNoLint:false, ExpectedNoLintLinter:""}

The previous behavior was causing a side effect on the Nolint processor.

EDIT: the invalid issues reported by contextcheck will not produce a warning because it's a known bug.

Fixes #4550

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[ldez]

For the details:
Previously inside the AutogeneratedExclude processor, this issue.FilePath() == "" was evaluated after this filepath.Ext(issue.FilePath()) == ".go" but it's impossible for a file path to be xx.go and empty at the same time.

When I added the new option for the AutogeneratedExclude processor, I fixed the behavior.

The problem is that the AutogeneratedExclude processor was excluding reports not related to generated files.

And so welcome to side effects.