Allow jobs to be ignored in rapids-check-pr-job-dependencies

[ajschmidt8]

The rapids-check-pr-job-dependencies script is responsible for ensuring that the pr-builder job used by RAPIDS depends on all other jobs in the pr.yaml workflow. This is important because the pr-builder job is the only job that RAPIDS requires to pass before merging.

Previously, there was no way to ignore certain jobs from this check. This made it difficult to add optional jobs to the pr.yaml workflow.

This PR addresses that issue by allowing the rapids-check-pr-job-dependencies script to accept a positional argument of space-delimited job names that should be ignored.

The argument can be used like this:

rapids-check-pr-job-dependencies "job1 job2 job3"

It is intended to be used in our shared workflows like this:

- name: Check workflow file dependencies
  if: ${{ inputs.enable_check_pr_job_dependencies }}
  run: rapids-check-pr-job-dependencies "${IGNORED_JOBS}"
  env:
    IGNORED_JOBS: ${{ inputs.ignored_pr_jobs }}

It can then be used by calling repositories like this:

jobs:
  checks:
    secrets: inherit
    uses: rapidsai/shared-workflows/.github/workflows/checks.yaml@branch-24.06
    with:
      ignored_pr_jobs: >-
        job1
        job2
        conda-cpp-tests
        conda-python-tests

[ajschmidt8]

These changes can be tested pretty easily by copying any pr.yaml workflow (like this one) onto your local file system in this repository and running the following commands:

./tools/rapids-check-pr-job-dependencies
./tools/rapids-check-pr-job-dependencies "conda-cpp-tests"
./tools/rapids-check-pr-job-dependencies "conda-cpp-tests conda-cpp-build"
./tools/rapids-check-pr-job-dependencies "conda-cpp-tests non-existent-job"

[jameslamb]

Looks great, super clear and easy to follow. Thank you!

I left 2 related comments about making this less sensitive to extraneous whitespace. Do what you want with them.