Run benchmarks weekly in CI

[chapman39]

This PR...

• Adds run_benchmarks.py script that builds Serac, runs benchmarks, and moves resulting Caliper files in shared location on LC.
• Sets up CI such that this script is run on all platforms (ruby, lassen, tioga)
• Setup weekly Pipeline Schedule on Gitlab

Also,

• Disables benchmarks on full builds (since benchmarks are being compiled on src already)
• Fixes cray full CI builds? (it was not using the spec in specs.json)
• Fixes physics_benchmark_solid_nonlinear_solve benchmark to handle petsc being disabled
• Disables all cray CI jobs until all developers have access (only on-push was disabled previously)

[chapman39]

We could alternatively use some sort of CI_WORKFLOW_TYPE var which could be src, full, or benchmarks. That way we don't have to handle the two variables. I just don't have access to nightly build settings.

[chapman39]

In a future PR I'll update the docs to explain how to properly view this data on SPOT, but it's more or less the following:

• Go to https://lc.llnl.gov/spot2/?sf=/usr/WS2/smithdev/califiles
• Click the check mark button on the top right
• Ensure "cluster" is ticked on
• Click on "ruby" under the cluster pie chart (of whatever machine you want to view)
• Click on the benchmark you want to view under the "executable" pie chart
• Scroll down to the table and and select the "compare" tab
• Above the charts set "Group by" to "mpi.world.size"

You'll notice at the moment each chart is practically a straight line, because there haven't been any changes to Serac yet. If you want to view another cluster or executable, click on the previous one to deselect it before selecting a new one. That way to you don't view both at the same time.