Added a workflow that will transition a POEM to integrated when a PR is merged

[swryan]

Summary

• added the openmdao_update_poem workflow
  • this will run when a PR is opened or closed (and merged)
  • when a PR is opened, the Resolves tag will be checked to get the associated issue
  • the text of the issue will be checked for an associated POEM
  • If an Associated POEM is found:
    • if PR has just been opened, a message will be sent indicating that the POEM status will be transitioned to Integrated
    • if PR has just been merged, a workflow_dispatch event will be triggered on the POEMs repo to transition the POEM
  • Note that this relies on PRs and Issues using the prescribed GitHub templates

Also:

• added an empty permissions dictionary by default for all workflows
• updated NumPy, SciPy and pyOptSparse versions in the test workflow

Related Issues

• Resolves Automate POEM status change to Integrated #3048

Backwards incompatibilities

None

New Dependencies

None

[coveralls]

coverage: 89.734% (-0.3%) from 90.021%
when pulling 4760e18 on swryan:3048_poem_integrated
into fee4510 on OpenMDAO:master.