[CFE-840] - refactor: Updates the modal component to use the UnnnicDialog

[Aldemylla]

CFE-840## Description

Type of Change

• Refactoring (no functional changes, no api changes)

Motivation and Context

This change updates the modal component to use the UnnnicDialog component from the design system, providing a more consistent UI experience across the application.

Summary of Changes

• Replaced custom modal implementation with UnnnicDialog component
• Removed explicit icon properties from modal calls as they are now handled by the dialog component based on the scheme type
• Updated dialog type mapping to use appropriate feedback types (warning, attention, success)
• Fixed the leave organization description to include the organization name in all language files
• Simplified button type handling for modals
• Removed unused methods like openServerErrorAlertModal and showDeleteConfirmation

Description

This PR refactors the Modal component to leverage the UnnnicDialog component from our design system. The change maintains all existing functionality while providing a more consistent look and feel with the rest of the application. The refactoring removes redundant icon specifications since the dialog component now determines the appropriate icon based on the scheme type.

[Aldemylla]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [CFE-840] - refactor: Updates the modal component to use the UnnnicDialog  #1100 👈 (View in Graphite)
• [CFE-840] - refactor: replace Modal with UnnnicDialog in billing.vue for improved consistency and maintainability #1099
• [CFE-840] - refactor: Removed dead help view and related code #1098
• [CFE-840] - refactor: Replace deprecated UnnnicInputNext to UnnnicInput #1096
• [CFE-840] - refactor: Remove BillingCard and related components from billing views for improved structure and maintainability #1095
• [CFE-840] - refactor: Remove deprecated Unnnic components (UnnnicButtonIcon and UnnnicModal) #1094
• chore: update @weni/unnnic-system dependency to version 3.24.0 #1093
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 63.49206% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.38%. Comparing base (b3876c2) to head (cf6b7bd).

Files with missing lines	Patch %	Lines
src/components/external/Modal.vue	61.66%	23 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                            @@
##           refactor/migrate-billing-intern-modal    #1100      +/-   ##
=========================================================================
+ Coverage                                  50.18%   50.38%   +0.20%     
=========================================================================
  Files                                        180      180              
  Lines                                      20492    20387     -105     
  Branches                                     668      668              
=========================================================================
- Hits                                       10283    10272      -11     
+ Misses                                     10209    10115      -94     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.