feat: automate sync of ABI files from v1-core to xeon-dapp

[heyJonBray]

the purpose of this PR is to ensure that ABI files are in sync between v1-core and xeon-dapp now that the codebase is modularized.

updates

add a sync-abi-to-dapp workflow to run on pushes to main branch that:

• checks for changes in the abi/ directory
• if found, syncs files to xeon-dapp/src/abi/ on the ci/abi-sync branch
  • using SSH to securely handle the transfer

considerations

commits are made to the ci/abi-sync branch in the xeon-dapp repo
all branches in our codebases that begin with "ci/" are protected so that:

• only CI workflows can commit to them
• a PR is required to push to main
• all status checks must pass

[wellytg]

Does this code check for changes and create new branch if they exist? And PR

[heyJonBray]

@wellytg yes, it checks for changes in the ABI directory of this repo, and then makes a new branch and PR on the dapp repo with the updated files