Refactor MIG build process to run asynchronously with optional wait control

- Moved MIG data build commands into a dedicated 02_build_data.yml task file.
- Added async execution (async: 3600, poll: 0) for non-blocking build.
- Introduced mig_wait_for_build variable to optionally wait for completion.
- Added debug message to inform how to disable waiting via build_data.wait_for=false for performance.
- Updated config to use nested build_data.enabled and build_data.wait_for structure.
- Adjusted variable lookups accordingly.

https://chatgpt.com/share/689b54d2-e3b0-800f-91df-939ebc5e12ef

roles/web-app-mig/tasks/01_core.yml

@@ -20,12 +20,6 @@
   include_role:
     name: cmp-docker-proxy
 
-- name: Create tree
-  command: "infinito build tree --no-signal --alarm-timeout 0 -s {{  mig_roles_meta_volume }}"
-  when:
-  - mig_build_data
-
-- name: Create roles list
-  command: "infinito build roles_list --no-signal --alarm-timeout 0 -o {{ mig_roles_meta_list }}"
-  when:
-  - mig_build_data
+- name: Build data (single async task)
+  include_tasks: 02_build_data.yml
+  when: mig_build_data | bool