Set `filter=tree:0` for `breaking_against` as default when supported

[CGA1123]

buf 1.50.x adds support for an additional parameter for git inputs filter which allows for treeless and shallow clones.

This improves the performance of breaking significantly when run against larger repositories.

Making this a default would likely best be held off on until the next release of the buf CLI, which improves support for authentication via BUF_INPUT_HTTPS_{USERNAME,PASSWORD} environment variables, which this action relies for auth to GitHub.

Related: bufbuild/buf#3707
Related: #142

[emcfarlane]

Thanks for creating the issue! As a workaround for now you can also specify the breaking against as a local directory and do the git checkout using the checkout action: https://github.com/bufbuild/buf-action?tab=readme-ov-file#specify-the-input-directory

- uses: actions/checkout@v4
  with:
    path: head
- uses: actions/checkout@v4
  with:
    path: base
    ref: ${{ github.event.pull_request.base.sha }}
- uses: bufbuild/buf-action@v1
  with:
    input: head
    breaking_against: base