Remove content-optimization waffle dependency for trademark checks.

[wagnerand]

Describe the problem and steps to reproduce it:

The trademark check in https://github.com/mozilla/addons-server/blob/master/src/olympia/addons/utils.py#L32-L40 allows "... for Firefox" if the waffle switch content-optimization is turned off. We'd like to change that so it's disallowed regardless of the waffle switch.

STR:

1. Have an existing add-on.
2. Go to the developer hub and change the name to "Something for Firefox" or "Something for Mozilla".

What happened?

The add-on is successfully renamed.

What did you expect to happen?

An error should occur: Add-on names cannot contain the Mozilla or Firefox trademarks.

Anything else we should know?

(Please include a link to the page, screenshots and any relevant files.)

[jvillalobos]

Confirming that we're just closing the loop on the work done in mozilla/addons-linter#2158

[AlexandraMoga]

Verified fixed on -dev:

With the content-optimization waffle switch off, users are not able to submit an add-on that contains the terms (for) Mozilla or (for) Firefox in their names. The restriction also applies on the dev hub submission form[1] and in Edit product page[2]

[1]

[2]

[willdurand]

@jvillalobos @wagnerand we should probably update the various policy pages because XXX for Firefox is still allowed according to https://extensionworkshop.com/documentation/publish/add-on-policies/ or https://www.mozilla.org/en-US/foundation/trademarks/policy/