feat(company-skills): implement skill deletion with agent usage check

Added functionality to prevent deletion of skills that are still in use by agents. Updated the company skill service to throw an unprocessable error if a skill is attempted to be deleted while still referenced by agents. Enhanced the UI to include a delete button and confirmation dialog, displaying relevant messages based on agent usage. Updated tests to cover the new deletion logic and error handling.

ui/src/api/companySkills.ts

@@ -51,4 +51,8 @@ export const companySkillsApi = {
       `/companies/${encodeURIComponent(companyId)}/skills/${encodeURIComponent(skillId)}/install-update`,
       {},
     ),
+  delete: (companyId: string, skillId: string) =>
+    api.delete<CompanySkill>(
+      `/companies/${encodeURIComponent(companyId)}/skills/${encodeURIComponent(skillId)}`,
+    ),
 };