Minor improvements for FTheoryTools

[HereAround]

If nothing unexpected happens, then this PR should:

• Remove wrong and unused final 3 blowups for the big model.
• Serialize the resolutions.

cc @apturner @emikelsons

[apturner]

This all looks good, thanks @HereAround.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 18 lines in your changes missing coverage. Please review.

Project coverage is 84.58%. Comparing base (f55951b) to head (30582f4).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...eoryTools/src/Serialization/hypersurface_models.jl	35.71%	9 Missing ⚠️
...heoryTools/src/Serialization/weierstrass_models.jl	35.71%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4219      +/-   ##
==========================================
- Coverage   84.60%   84.58%   -0.02%     
==========================================
  Files         631      631              
  Lines       84946    84982      +36     
==========================================
+ Hits        71865    71883      +18     
- Misses      13081    13099      +18     

Files with missing lines	Coverage Δ
...ntal/FTheoryTools/src/Serialization/tate_models.jl	98.07% <100.00%> (+0.57%)	⬆️
...eoryTools/src/Serialization/hypersurface_models.jl	82.69% <35.71%> (-17.31%)	⬇️
...heoryTools/src/Serialization/weierstrass_models.jl	80.76% <35.71%> (-16.74%)	⬇️