Support module unload in modules file; unload xalt on Phoenix GPU

[sbryngelson]

Summary

• Adds <slug>-[all|cpu|gpu]-unload line support to toolchain/modules for specifying modules to unload after loading
• Unloads xalt on Phoenix GPU (p-gpu-unload xalt)

Test plan

• Source ./mfc.sh load -c p -m g on Phoenix and verify xalt is unloaded at the end

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Run ID: 7e3e373a-46a3-4954-9331-65277d4e4399

📥 Commits

Reviewing files that changed from the base of the PR and between 00aa603 and 3faf483.

📒 Files selected for processing (3)

• src/simulation/m_rhs.fpp
• toolchain/bootstrap/modules.sh
• toolchain/modules

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.76%. Comparing base (00aa603) to head (3faf483).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1387   +/-   ##
=======================================
  Coverage   64.76%   64.76%           
=======================================
  Files          71       71           
  Lines       18713    18713           
  Branches     1549     1549           
=======================================
  Hits        12119    12119           
  Misses       5638     5638           
  Partials      956      956           

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