Review list

[kasperg]

This PR results in a new page displaying a block showing a list of reviews.

• A new block for displaying an arbitrary from by ID is implemented
• A new form showing a review list with filter is implemented
• A new Page manager page displaying the form in the block is added

We also refactor tests bases:

• The parent test class is also used for the form and thus moved and renamed
• Handling of mock functions is moved to the individual test classes as they are the ones knowing which namespaces the mock functions should exist in

[kasperg]

I do not know how to fix the final indentation issue 😭 .

[kallehauge]

I found a double new line and that is it. Great work! :+1: