feat: remove the only-labels option

BREAKING CHANGE:
The option only-labels was removed

__tests__/constants/default-processor-options.ts

@@ -9,9 +9,8 @@ export const DefaultProcessorOptions: IIssuesProcessorOptions = Object.freeze({
   daysBeforeStale: 1,
   daysBeforeIssueStale: NaN,
   daysBeforePrStale: NaN,
-  daysBeforeClose: 30,
-  daysBeforeIssueClose: NaN,
-  daysBeforePrClose: NaN,
+  daysBeforeIssueClose: 30,
+  daysBeforePrClose: 30,
   staleIssueLabel: 'Stale',
   closeIssueLabel: '',
   exemptIssueLabels: '',