Integration tests aren't compatible with rennovatebot

[josephlewis42]

Rennovatebot isn't creating branches on the local repository, so the conformance tests which require this are failing. It's likely they will also fail for other external PRs as well.

functions-framework-php/tests/conformance/prerun.sh

Line 25 in 5b645ee

"google/cloud-functions-framework": "dev-'${GITHUB_HEAD_REF}'#'${FRAMEWORK_VERSION}'",

We should instead direct the integration tests to point at the currently checked out source in the GitHub action's pipeline. Perhaps something like this: https://stackoverflow.com/questions/29994088/composer-require-local-package

[josephlewis42]

Pinging @kenneth-rosario for GitHub Action knowledge, I think composer can use local files, but we might also be able to reference the remote repository in the prerun. Not sure which is best with pack involved.