chore: add scheduled auto-merge workflow and group Dependabot PRs by ecosystem

[Rafi-Microsoft]

Purpose

• Introduced a scheduled GitHub Actions workflow to auto-approve and auto-merge Dependabot PRs targeting the dependabotchanges branch.
• Also optimized the dependabot.yml configuration to group dependency updates by ecosystem and path, significantly reducing PR noise.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[Rafi-Microsoft]

@microsoft-github-policy-service agree company="Persistent"

[github-actions]

🎉 This PR is included in version 1.2.1 🎉

The release is available on GitHub release

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