Fix test avo warnings by removing redundant rake tasks loading.

[simi]

fixes following warning introduced at #3405

/home/retro/.gem/ruby/3.2.0/gems/avo-2.25.0/lib/tasks/tailwindcss_rails.rake:2: warning: already initialized constant ASSET_FILE
/home/retro/.gem/ruby/3.2.0/gems/avo-2.25.0/lib/tasks/tailwindcss_rails.rake:2: warning: previous definition of ASSET_FILE was here
/home/retro/.gem/ruby/3.2.0/gems/avo-2.25.0/lib/tasks/tailwindcss_rails.rake:4: warning: already initialized constant TAILWINDCSS_RAILS
/home/retro/.gem/ruby/3.2.0/gems/avo-2.25.0/lib/tasks/tailwindcss_rails.rake:4: warning: previous definition of TAILWINDCSS_RAILS was here

[codecov]

Codecov Report

Merging #3422 (e278d36) into master (776ddda) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3422   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files         130      130           
  Lines        3665     3665           
=======================================
  Hits         3606     3606           
  Misses         59       59           

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