CI/CD: This changes the linter config to adhere to "our" codestyle

This changes the enum format to the const format sice enums are treated
as consts.

The linter now ignores unused parameters which are used by the
ExternalSink subclass.

.github/workflows/.gdlintrc

@@ -18,7 +18,7 @@ comparison-with-itself: null
 constant-name: '[A-Z][A-Z0-9]*(_[A-Z0-9]+)*'
 duplicated-load: null
 enum-element-name: '[A-Z][A-Z0-9]*(_[A-Z0-9]+)*'
-enum-name: ([A-Z][a-z0-9]*)+
+enum-name: '[A-Z][A-Z0-9]*(_[A-Z0-9]+)*'
 expression-not-assigned: null
 function-argument-name: _?[a-z][a-z0-9]*(_[a-z0-9]+)*
 function-arguments-number: 10
@@ -37,4 +37,4 @@ sub-class-name: _?([A-Z][a-z0-9]*)+
 trailing-whitespace: null
 unnecessary-pass: null
 unused-argument: null
-disable: [class-definitions-order, max-file-lines, max-line-length, max-public-methods]
+disable: [class-definitions-order, max-file-lines, max-line-length, max-public-methods, unused-argument]