More tidy of mock data

[rcantin-w]

Who is this for?

Maintenance, part of #10289

What is it doing for them?

• TextAndImage gets flagged by Chromatic for pixel changes, so this was mainly to use the local asset strategy.
• https://www.chromatic.com/build?appId=62f13cdbd0ff140768a8d87b&number=5835 looks like MediaObject wasn't working right prior to these changes so that fixes it in Cardigan.
• Add context to tabbable files - they are still needed.

[github-actions]

Size Change: 0 B

Total Size: 971 kB

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