chore: Updated Dependabot config to group PRs and added workflow for scheduled auto-merge

[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.
• Enhanced rebase logic to handle merge conflicts using --strategy-option=theirs.
• Implemented multi-strategy auto-merge (merge, squash, rebase) with fallback handling.
• Improved overall script reliability and compatibility with repo-level merge restrictions.

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

• ...

Other Information

[Copilot]

Pull Request Overview

This PR adds a scheduled GitHub Actions workflow to auto-approve, rebase, and merge Dependabot PRs on the dependabotchanges branch, and refines the Dependabot configuration to group updates and limit open PRs.

• Introduces scheduled-Dependabot-PRs-Auto-Merge.yml for nightly and manual Dependabot PR processing with conflict rebasing and multi-strategy merge
• Updates .github/dependabot.yml to group dependency updates by ecosystem/path and set open-pull-requests-limit to 10

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/scheduled-Dependabot-PRs-Auto-Merge.yml	Adds workflow to fetch, rebase, and auto-merge Dependabot PRs on a schedule
.github/dependabot.yml	Optimizes grouping and limits for Dependabot updates across multiple paths

Comments suppressed due to low confidence (1)

.github/dependabot.yml:28

• [nitpick] The group name 'backend-deps' is reused in multiple blocks; consider using unique, more descriptive names per directory to avoid confusion.

backend-deps:

[Copilot]

Replace the unexpected '�' character in the comment with a standard hyphen or dash for clarity.

Suggested change

	# 2. Python dependencies � App
	# 2. Python dependencies - App

[Copilot]

Replace the unexpected '�' character in this comment with a standard hyphen or dash for consistency.

Suggested change

	# 3. Python dependencies � Azure Function
	# 3. Python dependencies - Azure Function

[Copilot]

[nitpick] This workflow contains extensive shell logic; consider extracting repeated steps into a composite action to improve readability and maintainability.

[github-actions]

🎉 This PR is included in version 1.2.0 🎉

The release is available on GitHub release

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