[build-utils] Add regions to lambda options

[msimulcik]

This is required for being able to specify regions in functions config in the File System API

Related Issues

Related to https://github.com/vercel/runtimes/issues/157

📋 Checklist

Tests

• The code changed/added as part of this PR has been covered with tests
• All tests pass locally with yarn test-unit

Code Review

• This PR has a concise title and thorough description useful to a reviewer
• Issue from task tracker has a link to this PR

[codecov]

Codecov Report

Merging #6829 (0297b51) into main (1be7571) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #6829   +/-   ##
=======================================
  Coverage   55.03%   55.03%           
=======================================
  Files          85       85           
  Lines        3594     3594           
  Branches      830      830           
=======================================
  Hits         1978     1978           
  Misses       1610     1610           
  Partials        6        6           

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