feat(api): add finding labels, finding URL and tenant info to Jira issues

send_findings_to_jira() now passes issue_labels (prowler, prowler-{provider},
prowler-{severity}, prowler-{check_id} and prowler-finding-{sanitized uid}),
a finding_url built from the new DJANGO_UI_BASE_URL setting (empty by
default, so self-hosted deployments emit no link unless configured) and the
tenant name as tenant_info. The label sanitizer is local to the API so it
does not depend on an unreleased SDK symbol.

api/.env.example

@@ -59,5 +59,9 @@ DJANGO_GITHUB_OAUTH_CLIENT_ID=""
 DJANGO_GITHUB_OAUTH_CLIENT_SECRET=""
 DJANGO_GITHUB_OAUTH_CALLBACK_URL=""
 
+# Public base URL of the Prowler UI, used to link Jira issues back to findings.
+# Leave empty to omit the link.
+DJANGO_UI_BASE_URL=""
+
 # Deletion Task Batch Size
 DJANGO_DELETION_BATCH_SIZE=5000