[CI] - disable hab2 multi-proc benchmark assertions

[aclegg3]

Motivation and Context

Disabling CI regression assertions on multi-processing hab2 benchmark in light of recently observed flakyness.
Possible source of flakyness is resource limits. CI machine claims to have 8vCPU, we run a 16 process benchmark. This could cause thrashing or resource allocation issues.

This should be re-enabled after investigation and possible corrections to the CI benchmarking workflow.
We'll still run the multi-process benchmark and generate artifacts for debugging and investigation purposes.

How Has This Been Tested

CI shows benchmark regression with habitat-sim commit (facebookresearch/habitat-sim@8eb02ad).
Local testing on cluster shows no regression.
Contents of commit should not impact performance, so CI flakyness is likely.

Types of changes

• [Docs change] Addition or changes to the documentation

Checklist

• My code follows the code style of this project.
• I have updated the documentation if required.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes if required.