Fix Linux prerequisite typo spellings in pre-commands

[Copilot]

This updates the Linux prerequisite-install pre-command block to match the reviewer’s requested spelling fixes. The change is limited to the local variable name and the emitted log/error strings.

• Scope

  • Touches only scripts/run_performance_job.py
  • No behavior change; log text and local naming only

• Changes

  • Rename combined_prequisites to combined_prerequisites
  • Correct prerequistes / prerequites in the non-Windows prerequisite install messages
  • Align Linux spelling with the existing Windows branch wording

• Example

  combined_prerequisites = " && ".join(install_prerequisites)
  helix_pre_commands += [
      'echo "** Installing prerequisites **"',
      f"{combined_prerequisites} || export PERF_PREREQS_INSTALL_FAILED=1",
      'test "x$PERF_PREREQS_INSTALL_FAILED" = "x1" && echo "** Error: Failed to install prerequisites **"'
  ]

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[Copilot]

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