[mock_uss] Add uses_cmsa option

[the-glu]

Fix #878

Add an option for the mock_uss to support or not cmsa.

This is done on flight injection level, preventing the injection of flights in the Nonconforming/Contingent state. This should prevent the mock_uss to do CMSA calls, but I may have missed some others cases.

[mickmis]

LGTM modulo comments

[BenjaminPelletier]

This looks good to me too after working out which locality does what.

We may have to discuss what to do if Switzerland also doesn't support CMSA. In that case, we might consider adding another locality similar to one of the two existing localities, but supporting CMSA, and move a relevant CI test to the new locality. But, that could be a different PR as long as we at least manually verify the functionality in this PR not covered by CI.

[the-glu]

as long as we at least manually verify the functionality in this PR not covered by CI.

I switched US's localitly's flag to off, and Switzerland one is still on, meaning this run should have tested both cases.

US, test are skipped dues to absence of CMSA: https://github.com/interuss/monitoring/actions/runs/20425171089/job/58684069081?pr=1304#step:5:798
CH, test are not skipped: https://github.com/interuss/monitoring/actions/runs/20425171089/job/58684069089?pr=1304#step:5:919