Refactor Address input component test file to new format

[precious-onyenaucheya-ons]

What is the context of this PR?

Fixes: ONSdigital/design-team#132
This PR involves refactoring of the address input 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: Address-input"

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 part of the work on this was to move the examples like EXAMPLE_MANUAL_INPUT_FIELDS out into its own file and then be imported. Have a look at one of the ones Bali has done

[rmccar]

Couple of minor things