Normalize backend and frontend format script names

[johnthagen]

In a similar vein of our test-frontend and test-backend script names, normalize the fmt scripts that automatically format code.

These also more closely align to the Python tox -e fmt command to format the Python code.

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This change is 

[codecov-io]

Codecov Report

Merging #757 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #757   +/-   ##
=======================================
  Coverage   50.24%   50.24%           
=======================================
  Files         235      235           
  Lines        6158     6158           
  Branches      398      398           
=======================================
  Hits         3094     3094           
  Misses       2770     2770           
  Partials      294      294           

Flag	Coverage Δ
#backend	53.67% <ø> (ø)
#frontend	47.08% <ø> (ø)

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[imnasnainaec]

Reviewed 3 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @johnthagen)