9314 Get JSON object from JsonUtil

[bencomp]

What this PR does / why we need it:

Work around a potential resource leak by using the existing JsonUtil (as suggested by @qqmyers)

Which issue(s) this PR closes:

Closes #9314

Special notes for your reviewer:
You're welcome, @pdurbin.

Suggestions on how to test this:
See Sonarcloud's number of issues go down.

Does this PR introduce a user interface change? If mockups are available, please link/include them here:
No

Is there a release notes update needed for this change?:
No

Additional documentation:
Perhaps add a note to the developer docs to make sure this doesn't happen again?

[coveralls]

coverage: 20.045%. remained the same when pulling 2ae1a9f on bencomp:9314-get-json-object into 4e1bc5b on IQSS:develop.

[pdurbin]

@bencomp thanks! Looks like a good fix to me.

I'll pass this onto QA once the Jenkins tests pass. That said, it probably doesn't matter because I don't see any code coverage for these lines at https://coveralls.io/builds/62689803/source?filename=src%2Fmain%2Fjava%2Fedu%2Fharvard%2Fiq%2Fdataverse%2Futil%2Fjson%2FJsonParser.java#L683

@kcondon when this comes to you, it looks like we do special handling of invalid country names when parsing our native JSON to create a dataset:

[pdurbin]

Jenkins tests are passing. Approved.

[kcondon]

@pdurbin Do you know where this code gets used in the app for regression testing purposes?