- this is really just a duplicate of test-core-crucible-ci and adds
  unnecessary jobs

…epending on the (optionally) provided filter

- this allows for certain projects to "control" how broad (or narrow)
  their CI testing coverage is

- plumb the new userenv-filter capability into the core-crucible-ci
  workflow

- test the new userenv-filter capability through the
  test-core-crucible-ci workflow

- the new userenv-filter functionality is really only useful to core
  crucible projects because projects of other types (ie. benchmarks
  and tools) need to be tested against all userenvs to ensure
  compatibility