Split diff by block type

[KevinMind]

Relates to: #22826
Relates to: #22828
Fixes: mozilla/addons#15147

Description

Split generate_diffs to include diffs for both hard and soft blocks. This is required for both stashing and filter updates.

Context

This patch is required by both of the linked PRs and to keep them independent we should land this (trivial) change first and rebase the other two.

Testing

This is a backaward compatible patch so automated testing is fine.

Checklist

• Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• Successfully verified the change locally.
• The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• Add before and after screenshots (Only for changes that impact the UI).
• Add or update relevant docs reflecting the changes made.

[willdurand]

This is looking promising. I have some comments.

[willdurand]

r+wc, thanks

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: argument of type 'NoneType' is not iterable olympia.blocklist.mlbf in <listcomp> View Issue

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