fix: fix commitExists() function for diff bigger than 30 commits

[korniychuk]

When the diff between NX_BASE & NX_HEAD is bigger than 30 commits the commitExests returns false, because it checks only last 30 commits inside the target branch. It happens because GET /repos/{owner}/{repo}/commits has default per_page value of 30.

In our workflow, a few times a week we have the diff ~50 commits since the last successful run. As the result nrwl/nx-set-shas can't find NX_BASE correct and returns HEAD~1.

Issue screenshot

[korniychuk]

Hi @JamesHenry 🙌 Please, help with it :)

[JamesHenry]

Thanks @korniychuk