Add missing babel properties to config validation

[JSteunou]

targets browserslistconfigfile browserslistenv assumptions was missing in validation, fixes #1133

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[JSteunou]

see

• https://babeljs.io/docs/en/options#targets
• https://babeljs.io/docs/en/options#browserslistconfigfile
• https://babeljs.io/docs/en/options#browserslistenv
• https://babeljs.io/docs/en/options#assumptions

[codecov]

Codecov Report

Merging #1135 (27f564d) into main (1c6378d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1135   +/-   ##
=======================================
  Coverage   82.09%   82.09%           
=======================================
  Files          56       56           
  Lines        1687     1687           
  Branches      462      462           
=======================================
  Hits         1385     1385           
  Misses        176      176           
  Partials      126      126           

Impacted Files	Coverage Δ
packages/conf/src/index.ts	79.74% <ø> (ø)

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[semoal]

LGTM, thanks for contributing =)

[JSteunou]

You're welcome, thank you for your effort on this project!