Fix: don't list old packages with categories incompatible with latest revisions

[mtojek]

Issue: #714

This PR addresses this and this issue, so that old packages are hidden from search results.

In tests:

example-0.0.2 has web category, but it's hidden from /search?category=web, because example-1.0.0 doesn't have this category. The implementation without all=true will focus only on latest packages. This is inline with numbers returned by category endpoint.

Personal comment:

I think that this search/category logic must be refactored as it's too much tangled at the moment.

[elasticmachine]

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• Start Time: 2021-09-09T12:26:57.193+0000

• Duration: 4 min 24 sec

• Commit: 4bffa2c

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Failed	0
Passed	95
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Total	95

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[jsoriano]

I think that this search/category logic must be refactored as it's too much tangled at the moment.

+1, I should continue with #703 😅 where the search code is refactored an unified so all endpoints use the same.