fix(run): fully defer to Nx for dep detection when nx.json exists

[ghiscoding]

Description

As per original Lerna PR 3345

• Only sends "targetDependencies" from Lerna to Nx when nx.json does not exist.
• Updates the warning when using --include-dependencies to indicate that Lerna will send Nx additional dependencies to run.
• Updates docs to be more clear on the differing behavior.
• Adds a note to the docs when installing Nx that lerna run will behave differently and links to the page describing the differences.

Motivation and Context

stay in sync with original 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 #360 (0657aa4) into main (0fc9af9) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   96.16%   96.16%           
=======================================
  Files         145      145           
  Lines        4266     4266           
  Branches      975      975           
=======================================
  Hits         4102     4102           
  Misses        164      164           

Impacted Files	Coverage Δ
packages/run/src/run-command.ts	95.61% <100.00%> (ø)

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