Do not show the panel if there are no attributes (V3 blocks)

[cbravobernal]

What

I commented the "Connect Field" sidebar option cause it was interfering with the new v3 blocks interface.

With the fix applied, if there are no bindable attributes, is not displayed on non compatible blocks.

Not showing on a v3 block:

Showing in a paragraph block:

[github-actions]

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Props cbravobernal, priethor.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.37%. Comparing base (e870b55) to head (0c0da13).
⚠️ Report is 4 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##             trunk    #243      +/-   ##
==========================================
+ Coverage     1.17%   3.37%   +2.19%     
  Complexity    4416    4416              
==========================================
  Files          261     261              
  Lines        27017   27017              
==========================================
+ Hits           318     911     +593     
+ Misses       26699   26106     -593     

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