[cli] Major: remove "now" prop from package.json

[styfle]

Its not clear if this feature was ever documented, but we should consider this semver major to remove it.

Apparently, you could use a "now" prop in package.json instead of a separate now.json or vercel.json file.

This PR also removes a @ts-ignore in favor of handling a case when package.json fails to parse.

[codecov]

Codecov Report

Merging #7186 (1daa3cb) into main (ca433a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #7186   +/-   ##
=======================================
  Coverage   49.17%   49.17%           
=======================================
  Files         135      135           
  Lines        5426     5426           
  Branches     1358     1358           
=======================================
  Hits         2668     2668           
  Misses       2745     2745           
  Partials       13       13           

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