fix(cc-widgets): Widget station login issues

[zachraymer]

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

This pull request addresses

< DESCRIBE THE CONTEXT OF THE ISSUE >
Dial number only accepts US numbers. Needs to accept international numbers as well.
Form validation was not disabling the save/signin button when fields were empty.

by making the following changes

Dial number regex has been changed to include international numbers so we can support prodeu rollout
Disabled attribute on save button has logic to validate empty fields
< 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
  Testing was done with unit test scenarios as well as manual validation. Dial numbers other than US were entered and passed validation with + character optional. Dial numbers without country codes are not valid still. Empty fields such as missing team and missing dial number do not allow the save and sign in button to be enabled until they are completed.

The GAI Coding Policy And Copyright Annotation Best Practices

• 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)
  • Github Copilot
  • Other - Please Specify
• 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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[zachraymer]

https://app.vidcast.io/share/4f2f4c7a-bea4-4563-8b6f-a57227d97223