add environment activation command to diagnostics

[shapiromatron]

Add new configuration to the BMDS Desktop Manager so that the diagnostic information attempts to show the command to activate your virtual/conda environment, if it's able to detect the environment.

As an example:

--------------------------------
      BMDS Desktop Manager
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1) Start BMDS Desktop
2) Update BMDS Desktop
2p) Update BMDS Desktop (prerelease - EPA VPN required)
3) Show diagnostic information

Enter a number above, or q to quit: 3

Diagnostic Installation Information:
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Python Version:
Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun  6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)]

Python Path:
C:\Users\username\dev\bmds-ui\venv\Scripts\python.exe

To activate your environment, open a new terminal and run:
C:\Users\username\dev\bmds-ui\venv\Scripts\activate