Make improvements to the oEmbed endpoint

[dhruvkb]

Fixes

Fixes #927 by @AetherUnbound
Addresses #925 by @chrisbartoloburlo

Description

This PR fixes the issue of AssertionErrors being raised instead of a 404 response. The docs for get_api_exception say that they are supposed to be used with the raise keyword as what it returns are exceptions, not responses.

This PR also handles trailing slashes in URLs. We have been consistently pushes for uniformly using trailing URLs everywhere so our own endpoints should reasonably support them. This is a backwards compatible change.

This PR also adds tests for these changes so that we never regress on them in the future.

Checklist

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• I added or updated tests for the changes I made (if applicable).
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[github-actions]

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https://wordpress.github.io/openverse-api/_preview/934

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[AetherUnbound]

Looks good, thanks for the additional tests!

[krysal]

Excellent!