Make pagination more consistent.

Not sure whether this needs test or not.

I think it does because I think if we revert the change accidentally elsewhere we'd want to know.

This issue requires a new endpoint in DrupalOrgClientMiddleware. But filter ID's are changed on DO, so I think an update in fixture is required before working on this issue further. Next steps once fixture is regenerated:

• Add testPagingOptions test in ProjectBrowserUiTestJsonApi.php also, which currently exists in ProjectBrowserUiTest.php
• Add new endpoint in DrupalOrgClientMiddleware.php and use in above test
• Fix nightwatch test.

I'm doing the fixes for the regeneration script at 🐛 Improve fixture regeneration script Active

This is ready for reviews now.The CI fails are unrelated.

I have one small nit (filename) and then this needs manual testing but then is probably ready to go.

Ready for review and manual testing.

Tested manually, and the change in page size in one tab is properly reflected in another tab. Moving it to RTBC.

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