Issue labelling: update Occurrence label

Lets use slightly more sensible labels for Occurrence: Frequent,
Occasional and Uncommon.

.github/workflows/issues_to_projects.yaml

@@ -8,7 +8,7 @@ jobs:
         if: >
             contains(github.event.issue.labels.*.name, 'X-Needs-Design') &&
              (contains(github.event.issue.labels.*.name, 'O-Frequent') ||
-              contains(github.event.issue.labels.*.name, 'O-Intermediate')) &&
+              contains(github.event.issue.labels.*.name, 'O-Occasional')) &&
              (contains(github.event.issue.labels.*.name, 'S-Critical') ||
               contains(github.event.issue.labels.*.name, 'S-Major') ||
               contains(github.event.issue.labels.*.name, 'S-Minor'))

.github/workflows/triage-priority-bugs.yml

@@ -11,7 +11,7 @@ jobs:
         contains(github.event.issue.labels.*.name, 'T-Defect') &&
         contains(github.event.issue.labels.*.name, 'S-Critical') &&
         (contains(github.event.issue.labels.*.name, 'O-Frequent') ||
-         contains(github.event.issue.labels.*.name, 'O-Intermediate')) ||
+         contains(github.event.issue.labels.*.name, 'O-Occasional')) ||
         contains(github.event.issue.labels.*.name, 'S-Major') &&
         contains(github.event.issue.labels.*.name, 'O-Frequent') ||
         contains(github.event.issue.labels.*.name, 'A11y') &&