XWiki: increase installer execution timeout and add retries

The task 'XWIKI | Execute installer page' now uses:
- timeout: 300 (allow up to 5 min per request)
- retries: 20
- delay: 15
- until: condition

This prevents early failures during the first Distribution Wizard bootstrap when hundreds of extensions are still being installed.

Context: https://chatgpt.com/share/68ca0f18-2124-800f-a70d-df1811966107

roles/docker-compose/handlers/main.yml

@@ -41,7 +41,7 @@
     - docker compose up
     - docker compose restart
 
-- name: Build docker compose 
+- name: Build docker compose
   shell: |
     set -euo pipefail
     docker compose build || {