fix(run): allow for loading of env files to be skipped

[ghiscoding]

Description

As per Lerna 3375

Makes one subcomponent of the change of default task runner more explicit, namely the automatic loading of .env files.
Also adds a flag to allow users to disable this behavior if they wish (added as a fix because it was an oversight for the v6 release)

Motivation and Context

keep in sync with Lerna

How Has This Been Tested?

Types of changes

• Chore (change that has absolutely no effect on users)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #391 (7297c64) into main (c585090) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   97.31%   97.31%   +0.01%     
==========================================
  Files         146      146              
  Lines        4334     4335       +1     
  Branches     1003     1004       +1     
==========================================
+ Hits         4217     4218       +1     
  Misses        117      117              

Impacted Files	Coverage Δ
packages/cli/src/cli-commands/cli-run-commands.ts	100.00% <ø> (ø)
packages/run/src/run-command.ts	100.00% <100.00%> (ø)

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