feat(cc-widgets): resolve webpack build failure for http/https modules

[akulakum]

COMPLETES #https://jira-eng-sjc12.cisco.com/jira/browse/CAI-7419

This pull request addresses

A build failure in the CI/CD pipeline caused by Webpack 5 no longer including polyfills for Node.js core modules (http, https) by default. The eventsource library (dependency of @webex/cc-digital-channels) requires these modules, causing the cc-widgets package build to fail with "Module not found" errors.

by making the following changes

Added resolve.fallback configuration in packages/contact-center/cc-widgets/webpack.config.js to set http: false and https: false, instructing webpack to ignore these Node.js-specific modules since browsers have native EventSource API support.

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)
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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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