Enforce Compilers

[michaelmckinsey1]

Description

• Disable all compiler search #572 originally fixed this issue by ignoring outside compiler configuration, but was undone by the systems refactor (Refactor Systems to Initialize Using Dictionaries #658). This PR aims to replicate the syntax from Disable all compiler search #572 that enforces spack to use the benchpark defined compilers.
• Addresses Prevent Ramble from looking for compilers #789

Before

compilers:
- compiler:
    environment: {}
    extra_rpaths: []
    flags:
   ...

After

'compilers:':
- compiler:
    environment: {}
    extra_rpaths: []
    flags:
   ...

Adding/modifying core functionality, CI, or documentation:

• Update lib/benchpark/system.py to use specific syntax

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.74%. Comparing base (3e7d976) to head (38884a1).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #802   +/-   ##
========================================
  Coverage    40.74%   40.74%           
========================================
  Files           15       15           
  Lines         1107     1107           
  Branches       152      152           
========================================
  Hits           451      451           
  Misses         620      620           
  Partials        36       36           

Flag	Coverage Δ
unittests	40.74% <ø> (ø)

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[michaelmckinsey1]

laghos tioga CI Failure expected