[CFE-840] - refactor: Remove BillingCard and related components from billing views for improved structure and maintainability

[Aldemylla]

Description

Type of Change

• Refactoring (no functional changes, no api changes)

Motivation and Context

Removed unused billing card components and simplified the billing flow by removing the plans selection page.

Summary of Changes

• Removed Card.vue component which was used for displaying different billing plan options
• Removed ModalAddCreditCard.vue component which was used for adding credit card information
• Removed PlansSelector.vue component which was used for selecting billing plans
• Removed Plans.vue form from the register flow
• Updated router.js to remove the billing plans route and related aliases
• Simplified the BillingPlans.vue view by removing plan selection functionality
• Removed related actions from the billing store
• Removed tests for the Card component

[Aldemylla]

• [CFE-840] - refactor: Updates the modal component to use the UnnnicDialog  #1100
• [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 👈 (View in Graphite)
• [CFE-840] - refactor: Remove deprecated Unnnic components (UnnnicButtonIcon and UnnnicModal) #1094
• chore: update @weni/unnnic-system dependency to version 3.24.0 #1093
• main

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.65%. Comparing base (8189e1a) to head (67e7d2c).

Files with missing lines	Patch %	Lines
src/views/billing/plans/BillingPlans.vue	44.44%	5 Missing ⚠️

Additional details and impacted files

@@                               Coverage Diff                                @@
##           refactor/remove-deprecated-unnnic-components    #1095      +/-   ##
================================================================================
- Coverage                                         50.78%   50.65%   -0.13%     
================================================================================
  Files                                               188      184       -4     
  Lines                                             22144    21075    -1069     
  Branches                                            707      678      -29     
================================================================================
- Hits                                              11245    10675     -570     
+ Misses                                            10899    10400     -499     

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