Switch regex strategy to sampling strategy to improve performance

[jdangerx]

See this failure, which is due to slow strategies: #2968 (comment)

We already know that pandera strategy generation is slow - combining that with the slowness of generating strings based on regex was too much I think.

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (548b958) 88.6% compared to head (e5138a6) 88.6%.
Report is 62 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff           @@
##             dev   #2998    +/-   ##
======================================
  Coverage   88.6%   88.6%            
======================================
  Files         91      91            
  Lines      10854   10991   +137     
======================================
+ Hits        9618    9749   +131     
- Misses      1236    1242     +6     

Files	Coverage Δ
src/pudl/transform/params/ferc1.py	100.0% <ø> (ø)
src/pudl/output/ferc1.py	88.2% <69.2%> (-0.5%)	⬇️
src/pudl/transform/ferc1.py	96.7% <94.8%> (+<0.1%)	⬆️

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