fix: disabled inline formating and empty line in code block

[TomasSlama]

FX-4184

Description

We had two issues:

• when an empty line was converted CodeBlock, it was not looking nice. The problem was that even if there was no text, we were appending the CodeBlock with TextNode. Empty TextNode has no height, so I added a condition to not add the empty TextNode. Instead the BR appears by default.
• Disabling inline formatting was not working correctly as it was triggered from two places that were overlapping, so after moving it into one place it works as expected

How to test

• Temploy
• FIXME: Add the steps describing how to verify your changes

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Breaking change

• codemod is created and showcased in the changeset
• test alpha package of Picasso in StaffPortal

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[TomasSlama]

@toptal-anvil ping reviewers

[sashuk]

Code looks good, tested manually on temploy (visual test changes helped too)!

[mkrl]

Looks good, checked the screenshot tests 👍