Add test cases to analysis web worker spec

[igorschoester]

Summary

This PR can be summarized in the following changelog entry:

• [non-user-facing] Adds tests to the Analysis Web Worker spec.

Relevant technical choices:

• Add spec for the worker initialize with research data.
• Add spec for the worker initialize with default query params.
• Apply auto formatting.
• Using get morphology data spec helper.

Test instructions

This PR can be tested by following these steps:

• Inspect the specs to see if they are up to par.
• Check the code coverage to see if it is closer to 100% (see the issue for which parts should now be covered).

Fixes #1921

[hansjovis]

CR: 👍

Almost there 😄:

File                       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------------|----------|----------|----------|----------|-------------------|
 AnalysisWebWorker.js      |    99.09 |    97.48 |    96.77 |    99.08 |           383,384 |