feat(ci): add Webex bot to comment SDK version and changelog on merged PRs

[vamshigovardhana]

COMPLETES #https://jira-eng-gpk2.cisco.com/jira/browse/SPARK-761506

This pull request addresses

Adds a new GitHub Actions workflow to send release notifications to a Webex Space

• Triggers after Deploy CD workflow completes successfully
• Uses yarn package-tools list --recursive for accurate package detection
• Posts SDK version, PR link, and changelog URL to the configured Webex Space

by making the following changes

1. Workflow triggers after Deploy CD completes on next branch
2. Extracts version and PR number from the latest git tag
3. Uses package-tools to detect affected packages (with recursive dependency detection)
4. Sends a formatted message to the Webex Space via Webex API

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 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

I certified that

• I have read and followed contributing guidelines
• I discussed changes with code owners prior to submitting this pull request
• I have not skipped any automated checks
• All existing and new tests passed
• I have updated the documentation accordingly

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