Add mixtral recipe reg tests on a3ultra

[gunjanj007]

Description

This code

1. Adds an a3ultra worload
2. makes functions more generalizable and robust.

Tests

Test composer envs

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run one-shot tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.

[polydier1]

remove unused comments?

[polydier1]

one comment, everything else looks good to me.