Move page and page_size query param validation into serializer

[sarayourfriend]

Fixes

Related to #857 and #843

Description

In this PR I move scattered query parameter validation into the query serializer, where it probably belongs. This has two benefits:

1. It removes code in favour of using built-in Django Rest Framework serializer validation
2. It removes usages of the bespoke get_api_exception
3. It reduces instances of a loose pattern of scattered validation where parameter validation happens multiple times and deep into the runtime of a search query, rather than once at the top (where it is expected to happen and easier to find)

None of these changes change the API surface.

The lines changed is also deceptive on this PR as something like 85 of the lines added or changed were in the tests.

Testing Instructions

Ensure CI passes. Checkout the branch, set up the local API following the README instructions and make some smoke test requests to ensure everything works as expected.

Checklist

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• [x] I added or updated tests for the changes I made (if applicable).
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• [x] I tried running the project locally and verified that there are no visible errors.

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[sarayourfriend]

Keeping this PR as a draft as it should not be merged until we've fixed the production ES CPU usage.

[dhruvkb]

@sarayourfriend since the ES CPU usage is under control now, should we push to update, undraft and get this PR merged?

[dhruvkb]

Diff before updating to main, preserved for self-reference.