Refactor Autosuggest component test file to new format

[precious-onyenaucheya-ons]

What is the context of this PR?

Fixes: ONSdigital/design-team#134
This PR involves refactoring of the autosuggest test document to follow the Given, When, Then testing approach.

How to review this PR

Functionality:

• Run the test suite using: yarn test --testNamePattern="FOR: Macro: Autosuggest"

Does this testing refactor meet the following success criteria:

• Clearly structured.
• Follows naming conventions.
• Consistent.
• Concise.
• Suited to our codebase.
• Compatible with existing testing framework.

Look at the refactored code in relation to:

• The original test document.
• The macro file.
• The macro options file.

Checklist

This needs to be completed by the person raising the PR.

• I have selected the correct Assignee
• I have linked the correct Issue

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[rmccar]

I think some more work needs to be done here, use one of the other PRs as a template. We are missing the "FOR" and "THEN" in some cases

[rmccar]

Ive realised we are missing tests for the language and resultsThreshold params. I think we should add these

[rmccar]

I think you need to check the required the params in the documentation some of these in the required describe aren't required still. Also the "params none" describe you've added actually passes in a lot of params because it uses EXAMPLE_AUTOSUGGEST. I don't think we need this describe though, we should be testing these things with the required params because we expect those params to be passed in

[rmccar]

Few tests I thought that could be added to improve our coverage

[rmccar]

Couple of typos