fix: generate flutter amp config in lib

[edwardfoyle]

Issue #, if available:

Description of changes:

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[codecov]

Codecov Report

Merging #6571 (9949e95) into master (4e24c1d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6571   +/-   ##
=======================================
  Coverage   56.98%   56.98%           
=======================================
  Files         481      481           
  Lines       21843    21843           
  Branches     4359     4359           
=======================================
  Hits        12448    12448           
  Misses       8514     8514           
  Partials      881      881           

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[github-actions]

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