DDF-4903 Fix render loop caused by poller in dropdown.js

[adimka]

What does this PR do?

Fixes a render loop in dropdown.js caused by React's equality check not being sufficient for this model.

Who is reviewing it?

@samuelechu @mojogitoverhere

Select relevant component teams:

@codice/ui

Ask 2 committers to review/merge the PR and tag them here.

@djblue
@vinamartin

How should this be tested?

Open a component using react-comppnent/dropdown/dropdown.js
Throw a debug in that component's render method.
Ensure that the debug isn't hit constantly.

Any background context you want to provide?

What are the relevant tickets?

Fixes: #4903

Checklist:

• Documentation Updated
• Update / Add Threat Dragon models
• Update / Add Unit Tests
• Update / Add Integration Tests

Notes on Review Process

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1. Set a breakpoint in the render function of the location.js react component
2. Created a new anyGeo query
3. Verified the breakpoint was only hit 5 times (once for each item in the dropdown)
4. Also verified the fix in a different dropdown component in a downstream project