Bugfix: registerBlockType filter

[whoami-pwd]

What does this do/fix?

• Provides possible solution for blocks.registerBlockType filter issue
• Provides an example of removing align settings for core/separator block
• Provides an example of filtering align settings for core/embed block

QA

Links to relevant issues

• Link to Issue

Tests

Does this have tests?

• [ ] Yes
• [x] No, this doesn't need tests
• [ ] No, I need help figuring out how to write the tests.

[ChrisMKindred]

@alexander-kozhukhovski Can you add a changelog entry, please?

[whoami-pwd]

@alexander-kozhukhovski Can you add a changelog entry, please?

Changelog entry added