test: remove criterion benchmarks in no_block_pr

These tests have been failing consistently in our CI for as long as I
can remember. While each individual test false positive rate is not
high, the fact that we run many of them in a multitude of combinations
means that at every CI run at least one fails.

With this change, we are removing them from the PR - Optional step. We
will still be able to notice performance regressions from the
performance tests, so we're not losing much test coverage.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>

Author: Manciukic