11387 fix input level api

[sekmiller]

What this PR does / why we need it: fixes input level so that previously entered custom values are not wiped out of the api is used again with other dataset field types being given custom values. the only way to remove a custom value for input levels in a given dataverse is to pass in an empty array for input levels or explicitly re-setting them via the api with a json array that has the default values.

Which issue(s) this PR closes:

• Closes Input Level API overwrites existing displayOnCreate settings #11387

Special notes for your reviewer:
When running the integration tests (DataversesIT#testUpdateInputLevels) I noticed an error in the log saying that the command was receiving an empty or null input level array. This error was also present in the previous version of the test and doesn't prevent them from passing.
dev_dataverse> Error while executing command edu.harvard.iq.dataverse.engine.command.impl.UpdateDataverseInputLevelsCommand@14fb88b8
dev_dataverse> edu.harvard.iq.dataverse.engine.command.exception.CommandException: Error while updating dataverse input levels: Input level list cannot be null or empty
dev_dataverse> at edu.harvard.iq.dataverse.engine.command.impl.UpdateDataverseInputLevelsCommand.execute(UpdateDataverseInputLevelsCommand.java:30)
dev_dataverse> at edu.harvard.iq.dataverse.engine.command.impl.UpdateDataverseInputLevelsCommand.execute(UpdateDataverseInputLevelsCommand.java:16)
Suggestions on how to test this:
Run the input level update api several times and make sure that previous values are not deleted unless explicitly included in the api (or an empty array is passed)

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:
none

[coveralls]

coverage: 23.544% (+0.003%) from 23.541%
when pulling 6512eb3 on 11387-fix-inputLevel-api
into 08b9ec6 on develop.

[ofahimIQSS]

looks like continuous integration is failing on this one

[sekmiller]

All checks passing now

[github-actions]

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[ofahimIQSS]

very nice - tests passing - merging