fix(cc-widgets): update station login component to use international dialing prop

[zachraymer]

COMPLETES #https://jira-eng-sjc12.cisco.com/jira/browse/CAI-7303

This pull request addresses

International dialing is now a station login prop so that consuming applications can use ff gating to enable
< DESCRIBE THE CONTEXT OF THE ISSUE >

by making the following changes

Adds the internationaDialNumber prop to station login component
Changes the dial number regex logic to use international format if passed as prop
Falls back to agent config regex or US format
< DESCRIBE YOUR CHANGES >

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

• The testing is done with the amplify link
  < ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

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• GAI was not used (or, no additional notation is required)
• Code was generated entirely by GAI
• GAI was used to create a draft that was subsequently customized or modified
• Coder created a draft manually that was non-substantively modified by GAI (e.g., refactoring was performed by GAI on manually written code)
• Tool used for AI assistance (GitHub Copilot / Other - specify)
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• This PR is related to
  • Feature
  • Defect fix
  • Tech Debt
  • Automation

Checklist before merging

• I have not skipped any automated checks
• All existing and new tests passed
• I have updated the testing document
• I have tested the functionality with amplify link

---

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[mkesavan13]

• Kindly add this toggle to sample app
• Add a tiny VidCast of testing this change

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[zachraymer]

https://app.vidcast.io/share/1d2fd0d0-c8cd-4c14-ae91-7cb84704fc73?playerMode=vidcast
Vidcast showing samples app toggle and functionality

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