Add more linters to improve code readability (#19989)

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

modules/markup/common/footnote.go

@@ -203,9 +203,8 @@ func (b *footnoteBlockParser) Open(parent ast.Node, reader text.Reader, pc parse
 		return nil, parser.NoChildren
 	}
 	open := pos + 1
-	closes := 0
 	closure := util.FindClosure(line[pos+1:], '[', ']', false, false) //nolint
-	closes = pos + 1 + closure
+	closes := pos + 1 + closure
 	next := closes + 1
 	if closure > -1 {
 		if next >= len(line) || line[next] != ':' {