Misc small changes

[esoteric-ephemera]

Scope of PR has changed, leaving this here for future documentation:

There are two synthesis schemas in emmet.core.synthesis:

• SynthesisRecipe (curent change): actual data schema
• SynthesisSearchResultModel (previous): data schema + Atlas search metadata

Since the Atlas search fields are pruned by emmet-api before returning to the user, we don't need to pass these additional, unused fields to the user
The Atlas search fields are only injected if keyword search is used, and they are still returned to the user. So the appropriate schema for this endpoint would be SynthesisSearchResultModel generally

See emmet-core updates here for more info on the Atlas search related fields

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.82%. Comparing base (bd4edbb) to head (f898181).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
==========================================
+ Coverage   86.80%   86.82%   +0.02%     
==========================================
  Files          47       47              
  Lines        2682     2680       -2     
==========================================
- Hits         2328     2327       -1     
+ Misses        354      353       -1     

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