chore: updated auto merge workflow

[Rafi-Microsoft]

Purpose

• 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

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information