feat: Implement Flask-Limiter on the search module

[petesfrench]

Issue

Fixes https://warthogs.atlassian.net/browse/WD-12317

[carkod]

Can you fix the test, I think the test can pretty much be a QA

[carkod]

Out of scope for this PR, but @samhotep we need IP address for search to track agents who spam us and store the rate limit in memory, since IPs are proxied, what would you recommend for this? I guess we can't use the same solution of the telephone number because this endpoint could be any ?search=xxx and this module only accepts a remote address function.

[samhotep]

We'd need to force the content-cache to forward a custom header with the ip address probably, to preserve both the content-cache and remote IPs, and then update the limiter to use that header..
It's just an idea for now, but I'll check to see if the content-cache supports this

[carkod]

This implementation doesn't work, the moment I removed this decorator, everything passed locally. So I came up with another better implementation:

with limiter.limit(request_limit):
  flask.render_template(
                    template_path,
                    query=query,
                    start=start,
                    num=num,
                    results=results,
                    siteSearch=site_search,
                ),
                {"X-Robots-Tag": "noindex"},
            )

This seems to pass the tests. Of course you'd need to do it twice, in both returns.

[carkod]

This doesn't work also because you are creating and overriding an exisiting Flask app. So you need to

from flask import current_app
.....

limiter = Limiter(
        get_remote_address, app=current_app, default_limits=[request_limit]
    )

[samhotep]

@petesfrench this one in particular

[samhotep]

@petesfrench Carlos' comments are worth looking into :)

[petesfrench]

Thanks @samhotep! Can you take another look pls

[samhotep]

LGTM!