Feat pull remote fetch

[chengcyber]

Basic Checks

Have you run rush change for this change?

• Yes
• No

If No, please run rush change before, this is necessary.

If adding a new feature, the PR's description includes:

• Reason for adding this feature
• How to use
• A basic example

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Summary

sparo fetch and sparo pull automatically clean up merged branches from the git configuration before actually invoking git fetch or pull

Detail

Assuming "nonexistent" branch is tracking in the git configuration. Before "sparo fetch" calls the actual "git fetch" command, it will automatically check the existence of the branch in remote, and remove it from the git configuration if it doesn't exist remotely, such as it has been merged into the main branch.

How to test it

Local