Fix pagination bug

[olaughter]

Because of the way the backend processes the limit and offset values we ended up only ever getting ten results (aka the value of limit), this this turns out to be because we limit in the vespa query and then limit again in the result. Switching instead to have a fixed vespa limit resolves this issue until we can move limits to the vespa query

Description

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• a summary of the changes
• links to any related issue/ticket
• any additional relevant motivation and context
• details of any dependency updates that are required for this change

Type of change

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• Bug fix
• New feature
• Breaking change

How Has This Been Tested?

Please describe the tests that you added to verify your changes.

Reviewer Checklist

• The PR represents a single feature (small driveby fixes are also ok)
• The PR includes tests that are sufficient for the level of risk
• The code is sufficiently commented, particularly in hard-to-understand areas
• Any required documentation updates have been made
• Any TODOs added are captured in future tickets
• No FIXMEs remain

[diversemix]

Excellent code - particularly that test 😛