[cli] Remove withSpinner() helper

[TooTallNate]

It's not really necessary and doesn't use the common Output instance.

[codecov]

Codecov Report

Merging #6576 (9ccf6f8) into main (f1009a8) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6576      +/-   ##
==========================================
+ Coverage   12.31%   12.33%   +0.01%     
==========================================
  Files         272      271       -1     
  Lines        9802     9788      -14     
  Branches     1628     1627       -1     
==========================================
  Hits         1207     1207              
+ Misses       8497     8483      -14     
  Partials       98       98              

Impacted Files	Coverage Δ
src/commands/env/rm.ts	0.00% <0.00%> (ø)
src/commands/env/add.ts	0.00% <0.00%> (ø)
src/commands/env/pull.ts	0.00% <0.00%> (ø)
src/commands/domains/move.ts	0.00% <0.00%> (ø)
src/commands/domains/transfer-in.ts	0.00% <0.00%> (ø)
src/util/with-spinner.ts

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[styfle]

🧹