[cli] Remove initial iteration of vc build and Plugins

[TooTallNate]

The vercel build command is being restructured, so we'll remove it for now so that this initial iteration isn't included as part of the stable CLI release.

[styfle]

Lets also remove the .output change to .gitignore

[codecov]

Codecov Report

Merging #7390 (3fc6ad2) into main (59e4572) will decrease coverage by 0.87%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #7390      +/-   ##
==========================================
- Coverage   49.45%   48.57%   -0.88%     
==========================================
  Files         134      132       -2     
  Lines        5381     5295      -86     
  Branches     1350     1328      -22     
==========================================
- Hits         2661     2572      -89     
- Misses       2707     2710       +3     
  Partials       13       13              

Impacted Files	Coverage Δ
packages/cli/src/util/dev/server.ts	58.53% <ø> (-0.89%)	⬇️
packages/cli/src/util/projects/link.ts	58.33% <ø> (+0.73%)	⬆️
packages/cli/src/util/dev/errors.ts	71.42% <0.00%> (-21.43%)	⬇️
packages/cli/src/util/dev/builder-cache.ts	77.10% <0.00%> (-5.61%)	⬇️
packages/cli/src/util/output/color-name-cache.ts

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[EndangeredMassa]

There are a couple of references to vercel build in comments, but I don't think it's blocking.

• packages/cli/src/util/projects/project-settings.ts
• packages/build-utils/src/detect-file-system-api.ts