🚧Move internal visible setup

[CalvinWilkinson]

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• I have updated the title without removing the 🚧 emoji.

Description

Move all [assembly: InternalsVisibleTo("", AllInternalsVisible = true)] attributes to the csproj file.

This can be done with the example below:

<ItemGroup>
  <InternalsVisibleTo Include="$(AssemblyName).Testing" />
</ItemGroup>

For more info on this if required, refer to this video

Acceptance Criteria

• InternalsVisibleTo attributes moved.

ToDo Items

• Change type labels added to this issue. Refer to the Change Type Labels section below.
• Priority label added to this issue. Refer to the Priority Type Labels section below.
• Issue linked to the correct project (if applicable).
• Issue linked to the correct milestone (if applicable).
• Draft pull request created and linked to this issue (only required with code changes).

Issue Dependencies

No response

Related Work

No response

Additional Information:

Change Type Labels

Change Type	Label
Bug Fixes	🐛bug
Breaking Changes	🧨breaking changes
New Feature	✨new feature
Workflow Changes	workflow
Code Doc Changes	🗒️documentation/code
Product Doc Changes	📝documentation/product

Priority Type Labels

Priority Type	Label
Low Priority	low priority
Medium Priority	medium priority
High Priority	high priority

Code of Conduct

• I agree to follow this project's Code of Conduct.