[Feature] CLI Parameter for packages-install-path

[stevenayers]

resolves #9932

Problem

In the docs, under target-path, it says:

Just like other global configs, it is possible to override these values for your environment or invocation by using the CLI option (--target-path) or environment variables (DBT_TARGET_PATH).

However, the cli option for packages-install-path does not exist.

Solution

Add a CLI parameter --packages-install-path which populates DBT_PACKAGES_INSTALL_PATH in the same way --target-path does this for DBT_TARGET_PATH

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.41%. Comparing base (c53d67d) to head (33bd419).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9933      +/-   ##
==========================================
- Coverage   88.13%   85.41%   -2.73%     
==========================================
  Files         178      178              
  Lines       22544    22563      +19     
==========================================
- Hits        19870    19272     -598     
- Misses       2674     3291     +617     

Flag	Coverage Δ
integration	85.41% <100.00%> (-0.15%)	⬇️
unit	?

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[dbeatty10]

We're closing this for the reasons in #9932 (comment), but open to hearing additional examples or use-cases.