Fix [DockerVersion DockerSize] pagination

[PyvesB]

Some of our Docker tests that were using images with a lot of tags started failing recently. We were getting the following error back from the API:

pagination offset too large for anonymous requests; sign in to page further

This caps the pagination to 10 pages for unauthenticated requests: in all likelihood the result we're looking for is in those 10 first pages anyway.

Additionally, our DockerSize badge was effectively fetching the first page twice, once towards the start of its handle function, and a second time in getMultiPageData. The larger refactor addresses this and saves an API call.

[github-actions]

	Warnings
⚠️	📚 Remember to ensure any changes to config.private in services/docker/docker-version.service.js are reflected in the server secrets documentation.
⚠️	📚 Remember to ensure any changes to config.private in services/docker/docker-version.spec.js are reflected in the server secrets documentation.
⚠️	📚 Remember to ensure any changes to config.private in services/docker/docker-size.service.js are reflected in the server secrets documentation.
⚠️	📚 Remember to ensure any changes to config.private in services/docker/docker-size.spec.js are reflected in the server secrets documentation.

	Messages
📖	✨ Thanks for your contribution to Shields, @PyvesB!

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