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/process/manager_stacktraces.go

@@ -120,7 +120,7 @@ func (pm *Manager) ProcessStacktraces(flat, noSystem bool) ([]*Process, int, int
 
 	// We cannot use the pm.ProcessMap here because we will release the mutex ...
 	processMap := map[IDType]*Process{}
-	processCount := 0
+	var processCount int
 
 	// Lock the manager
 	pm.mutex.Lock()