feat(outbound): UI permissions

[aleksandernsilva]

Proposed changes (including videos or screenshots)

This PR adds UI permission checks covering the following:

• outbound.can-assign-any-agent: Allows the user to see and assign any agent from the selected department in the Replies step.
• outbound.can-assign-self-only: Restricts the user to assigning only themselves as the agent in the Replies step.
• outbound.can-assign-queues: Determines if the user can assign to any enabled department. Without this permission, the list is filtered to departments the user is a member of.
• outbound.send-messages: Controls the user's overall access to the Outbound Messaging feature.

This PR also adds a description to the agent field specific for situations where the user does not have any of the "assign agent" permissions.

Issue(s)

CTZ-249

Steps to test or reproduce

Further comments

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label
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Latest commit: 494461a

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[codecov]

Codecov Report

❌ Patch coverage is 76.59574% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.79%. Comparing base (b2266fc) to head (494461a).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feat/outbound-msg-ui   #36794      +/-   ##
========================================================
- Coverage                 66.83%   66.79%   -0.04%     
========================================================
  Files                      3374     3374              
  Lines                    114225   114256      +31     
  Branches                  21494    21500       +6     
========================================================
- Hits                      76345    76323      -22     
- Misses                    35179    35233      +54     
+ Partials                   2701     2700       -1     

Flag	Coverage Δ
e2e	56.87% <16.12%> (-0.02%)	⬇️
unit	72.22% <94.11%> (-0.05%)	⬇️

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