profile test and push

The T&P seems eating each other resources, collision/concurrency is suspected as leading to failing tests for unknown reason (NXP-25291, NXP-25626).
NXBT-2445 limiting the CPU (to only 2 cores) is suspected to have dramatically increased a lot of build duration, failing T&P among others.
The impact of CPU limit on T&P (and other jobs) could make sense since some parts of the build are multi-threaded. However, the statistics show that the build time increase happened before the CPU limit.
We need more measures and benchmarks.

Plan:

• setup a dedicated and isolated profiling environment NXBT-2460
• perform benchmarks with various CPU tuning NXBT-2462, NXBT-2463, NXBT-2464
• if limiting the CPU significantly changes the build time, perform tests to find which value drops down the performances.