Enable filtering by the service account's name and description in RBAC Group detail - Service accounts tab. 

Ticket to related API changes:
https://issues.redhat.com/browse/RHCLOUD-30375

Test Cases

1. Filter by a full existing service account's name, confirm match - High
2. Filter by a partial existing service account name, confirm multiple matches - High
3. Filter by a non-existent service account's name, confirm empty results - High
4. Filter by a full service account description, confirm one match - High
5. Filter by a partial service account description, confirm multiple matches - High
6. Filter by a non-existent service account description, confirm empty results - High