[19.0][MIG] queue_job_batch: Migration to 19.0

[YoussefEgla]

Port queue_job_batch to 19.0 and enable it in the repository.

What is included

• enable queue_job_batch again in 19.0 and remove it from the non-installable addon exclusions
• update the manifest and generated addon documentation for 19.0
• migrate the webclient/store integration to the 19.0 mail store API
• keep queue.job.create private while still attaching newly created jobs to a batch through the job_batch context
• update the systray store bootstrap so unread batch counters are loaded through store.add_global_values(...)
• update the systray menu component to use the current store service API
• adapt security setup from category_id to privilege_id
• restore the batch README example with minimal 19.0 adjustments
• add regression tests for:
  • store bootstrap values for batch users
  • the private protection on queue.job.create
  • creation of batched test jobs through the new controller helper
• fix the search view so the module installs on 19.0 by removing unsupported attributes from the search-view group node
• add /queue_job/create_test_batch, a controller route restricted to ERP managers that creates a batch and enqueues built-in queue test jobs into it for validation

Main technical changes

• controllers/webclient.py
  • migrate _process_request_for_internal_user to the 19.0 signature
  • push batch counter values with store.add_global_values(...)
• models/res_users.py
  • populate unread batch flags and counters with the 19.0 mail store bootstrap flow
• models/queue_job.py
  • mark create() as @api.private
  • keep linking created jobs to job_batch_id
• security/security.xml
  • use privilege_id for the batch user group
• static/src/Store.esm.js
  • drop the obsolete initMessagingParams override
• static/src/components/QueueJobBatchMenu.esm.js
  • switch to useService("mail.store")
  • load batch data with fetchStoreData("systray_get_queue_job_batches")
• views/queue_job_batch_views.xml
  • remove unsupported search-view group attributes so the module installs cleanly on 19.0
• controllers/main.py
  • add a batch-aware test endpoint and helper for manual validation
• tests/test_queue_job_batch.py
  • add coverage for the batch test helper in addition to the migration regression checks

Validation

• local editor diagnostics on the changed Python, JS, and XML files showed no errors
• manual validation was performed by creating a test batch through the new route and confirming the jobs reached done and the batch reached finished