All fetch operations fail on Firefox

[schoel-bis]

Describe the bug

See apache/superset#7364. Essentially:

callApi in superset-ui-connection will try to find an existing version of the data in the cache if the window.caches object exists. Unfortunately, as MDN states:

CacheStorage always rejects with a SecurityError on untrusted origins (i.e. those that aren't using HTTPS [...])

At that point, the CacheStorage API throws and the request for the CSRF token as well as the real request are never made.

I believe the correct solution to this problem would probably be to change the constant CACHE_AVAILABLE in superset-ui-connection/src/constants.ts to something like:

export const CACHE_AVAILABLE = 'caches' in self && (self.location && self.location.protocol) === 'https:';

To Reproduce

Steps to reproduce the behavior:

1. Setup on a non-TLS site
2. Visit with Firefox
3. Observe network panel in developer tools
4. See no fetch ever being launched

Expected behavior

Fetches should be executed

Environment (please complete the following information):

• superset-ui version: [e.g. v0.11.13]
• Node version: 10.16.0
• npm version: 6.9.0

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