Metadata uploader batch endpoints

[ksierks]

Description of changes

• updated createSamplesInProject & updateSamplesInProject in ProjectSamplesAjaxController.java to take more than one sample
• added a unique database constraint to the label column in the metadata_field table

Related issue

#1400

Checklist

Things for the developer to confirm they've done before the PR should be accepted:

• [ ] CHANGELOG.md (and UPGRADING.md if necessary) updated with information for new change.
• Tests added (or description of how to test) for any new features.
• User documentation updated for UI or technical changes.

[deepsidhu85]

One thing to start. It's a little bigger so it's a part of it's own review. If you have any questions let me know!

[deepsidhu85]

A few more small things

[deepsidhu85]

A few small changes to the urls

[ericenns]

Overall this is starting to look good, just some comments on the chunk handling.

[joshsadam]

So I have been slowly going through your code today and I think I found a slightly major performance issue with the UI revolving around you component SampleMetadataImportWizard. The problem with it is that the way you structured it, every time you load in a different component (e.g. SampleMetadataImportReview) the entire UI needs to be redrawn, which really decreases the performance of the page. This can definitely be cleane up after this PR and should really result in any huge code changes, we can talk about it after this PR. These are a few of the things I do need you to look at. Also, please look anywhere that you have used any any a TypeScript type, try to see if you can possibly type it, and if it cannot be, look into unknown and see if that addresses it. I think in you array-utilities this might work since you are passing in arbitraty arrays.

[joshsadam]

Thanks for all those changes