[BUGFIX] Add validation to Shard, Service, Project, and Farm name

[kfdm]

No description provided.

[codecov-io]

Codecov Report

Merging #228 into master will increase coverage by 0.12%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
+ Coverage   46.22%   46.34%   +0.12%     
==========================================
  Files          48       49       +1     
  Lines        2583     2589       +6     
==========================================
+ Hits         1194     1200       +6     
  Misses       1389     1389

Impacted Files	Coverage Δ
promgen/models.py	28.84% <0%> (ø)	⬆️
promgen/migrations/0012_validation_updates.py	100% <100%> (ø)

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