[whatwg/fetch] "should X be blocked" is a bad pattern (Issue #1714)

### What is the issue with the Fetch Standard?

1. These are not should requirements. They are musts.
2. They return non-Infra values.
3. The usage of headings and questions marks seems to lead to some bugs, such as not being able to navigate to the caller of [https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-mime-type?](https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-mime-type?)

Ideally we'd change Fetch, CSP, and Mixed Content around the same time so we can have this continue to be somewhat consistent.

Maybe something like:

> To determine if a response _response_ to a request _request_ **is blocked due to its MIME type**:
> 1. ...
> 2. Return true.

@antosart @carlosjoan91 thoughts?

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