Test summary stats on the main report page

[wblachowski]

Added a summary of urls results on test tiles. Based on a suggestion from #474.

Description

Each test contains a summary consisting of:

• number of failed URLs
• number of URLs with a warning
• number of passed URLs
• number of conditionally passed URLs
• number of accepted URLs

Motivation and Context

Closes #474

Screenshots (if appropriate)

Simple example. There are two URLs in "first-test". One with "rebased" status and one with "passed" status:

Test tile looks the following way:

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Main report page look:

Upgrade notes (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have reviewed (and updated if needed) the documentation regarding this change

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I hereby agree to the terms of the AET Contributor License Agreement.

[tkaik]

Good job!