Extend linter rules (#1300)

- dupword checks for duplicate words in the source code
- durationcheck checks for two durations multiplied together
- forbidigo forbids identifiers
- mirror reports wrong mirror patterns of bytes/strings usage
- misspell finds commonly misspelled English words in comments
- predeclared finds code that shadows one of Go's predeclared identifiers
- thelper detects Go test helpers without t.Helper() call and checks the consistency of test helpers

management/server/http/groups_handler_test.go

@@ -230,7 +230,7 @@ func TestWriteGroup(t *testing.T) {
 			expectedBody:   false,
 		},
 		{
-			name:        "Write Group PUT not not change Issue",
+			name:        "Write Group PUT not change Issue",
 			requestType: http.MethodPut,
 			requestPath: "/api/groups/id-jwt-group",
 			requestBody: bytes.NewBuffer(