Fix WF2 workflow: Add --autostash to git pull --rebase

[Copilot]

WF2 Monthly Monitor fails with error: cannot pull with rebase: You have unstaged changes when workflow artifacts exist in the working directory.

Changes

• Add --autostash flag to git pull --rebase in src/utils/git_ops.py

# Before
run_cmd(["git", "pull", "--rebase"])

# After  
run_cmd(["git", "pull", "--rebase", "--autostash"])

This handles edge cases where unstaged files (build artifacts, cache, etc.) exist outside the committed file set.

Original prompt

Reference: https://github.com/yajeddig/ResearchOps/commit/ae116af196b82656df7ede972817821c3b693f87/checks?check_suite_id=56040342067

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