Use a single pipeline for images.

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

Removes the copy-only pipeline for images without commands to fix #316

[codecov]

Codecov Report

Merging #321 (2fece11) into main (cc2fa1a) will increase coverage by 0%.
The diff coverage is 86%.

@@         Coverage Diff         @@
##           main   #321   +/-   ##
===================================
  Coverage    85%    85%           
===================================
  Files        83     83           
  Lines      2375   2371    -4     
  Branches    346    346           
===================================
- Hits       2026   2024    -2     
+ Misses      245    244    -1     
+ Partials    104    103    -1     

Flag	Coverage Δ
unittests	85% <86%> (+<1%)	⬆️

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Impacted Files	Coverage Δ
.../ImageSharp.Web/Middleware/ImageSharpMiddleware.cs	83% <85%> (+1%)	⬆️
...harp.Web/Middleware/ImageSharpMiddlewareOptions.cs	93% <100%> (ø)

... and 1 file with indirect coverage changes

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