apply_cmt_version must be tested more throughly.

[WenzDaniel]

Currently we are testing apply_cmt_version only very superficially when initializing the online context in straxen. However, I think this function is so fundamental in ensuring that we are applying the correct corrections that I think it must be tested more carefully either in straxen or cutax. We should at least check if all CMT options are updated correctly. A mistake here would not be directly obvious in data.

[WenzDaniel]

In the same PR we should also add tests for correction_name_from_urlstring and replace_url_version.

[WenzDaniel]

and extend the test for is_cmt_option to accommodate the URL config change.

[ershockley]

In #860 I add a few of the tests you mention:

• I remove correction_name_from_urlstring
• I add a test for replace_url_version
• I add a case for is_cmt_option

The big one is definitely apply_cmt_version though, I agree. I think we need to put this into cutax though. That is where we actually define the contexts with specific versions, so it is easier.