feat(ci): split linux-eic-shell into reusable workflows

[wdconinc]

Briefly, what does this PR introduce?

This PR splits linux-eic-shell into more managable chunks by using local reusable workflows.

What kind of change does this PR introduce?

• Bug fix (issue #__)
• New feature (issue: linux-eic-shell.yml is a mess)
• Documentation update
• Other: __

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

No.

Does this PR change default behavior?

No.

[veprbl]

LGTM

[veprbl]

LGTM

[wdconinc]

I can't tell what went wrong at https://eicweb.phy.anl.gov/EIC/benchmarks/detector_benchmarks/-/jobs/3773152 due to eic/EICrecon#1612 :-)

[veprbl]

It it's nightly it might be failing without the eic/detector_benchmarks#50, otherwise it should work.

[wdconinc]

It it's nightly it might be failing without the eic/detector_benchmarks#50, otherwise it should work.

You're telling me to force merge, right? ;-)

[wdconinc]

Now that detector_benchmark is fixed, I changed the required CI jobs to include check-geometry-configs / check-geometry-configs instead of check-geometry-configs (which now doesn't exist anymore). Other PRs will need to merge these changes or rebase after this is merged in main.