Skip deterministic-unit_test_estimators on mac in ci

[prckent]

Proposed changes

deterministic-unit_test_estimators has a 100% fail rate on mac ci

As far as I know there is no hint of either a full diagnosis or a solution; the problem is not seen elsewhere including other arm systems.

After such a long time I think the merit of having a passing CI exceeds the merit of having the mac ci fail, which results in a red check mark for every PR. If we merge this PR, I'll add a fresh issue on the mac problem.

What type(s) of changes does this code introduce?

• Testing changes (e.g. new unit/integration/performance tests)

Does this introduce a breaking change?

• No

What systems has this change been tested on?

None. Check for scripting errors.

Checklist

• Yes. This PR is up to date with current the current state of 'develop'
• NA. Code added or changed in the PR has been clang-formatted
• Yes/No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• Yes/No. Documentation has been added (if appropriate)

[ye-luo]

Test this please

[prckent]

Updated #4287