IQSS/multilicense_fixes

[qqmyers]

What this PR does / why we need it: Testing of other PRs uncovered a couple cases where example json/json-ld input files/inline code in the guides were out of date w.r.t. the multi-license PR in 5.10. This PR updates those examples, fixes a minor logging issue also discovered in testing, and updates a couple test classes where we were using a variant of the CC0 URI (ending in a terminal '/' ) - the tests weren't wrong per se, but we aren't using that form of the URL anymore in the code/examples.

Which issue(s) this PR closes:

Closes #

Special notes for your reviewer:

Suggestions on how to test this: When #8491 is merged, let me know and I can update this PR (there are changes to the same example file). Confirm that the json import examples in the guides work and the data-migration.jsonld example file. Verify the Unit tests still work (automated).

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[coveralls]

Coverage remained the same at 18.864% when pulling 31a2862 on GlobalDataverseCommunityConsortium:IQSS/mLicense_fixes into 0aaf203 on IQSS:develop.

[landreev]

This looks good - I'm going to approve it; let's keep an eye on it, and depending on which one is merged first, this one or #8491, make sure to update the other branch...

[kcondon]

Issues:

1. Getting 400 error when using new example to test dataset migration, server.log says: "Couldn't find a license for: https://creativecommons.org/publicdomain/zero/1.0]]" this is the response on the command line: "{"status":"ERROR","code":400,"message":"Bad Request. The API request cannot be completed with the parameters supplied. Please check your code for typos, or consult our API guide at http://guides.dataverse.org.","requestUrl":"http://localhost:8080/api/v1/dataverses/root/datasets/:startmigration","requestMethod":"POST"}" [Update 2] I was incorrect in my earlier statement, there is a cc0 item in the list, was thinking of custom terms. So, this error stands.