VSC-1770 add constraint in pytest install step

[brianignacio5]

Description

This pull request updates the PyTest package installation process for ESP-IDF unit tests to improve compatibility and reliability. The main changes include dynamically determining the ESP-IDF version to select the appropriate pip constraints file, handling tool paths more robustly, and updating the pip installation command to use constraints if available.

Improvements to PyTest package installation:

• Dynamically retrieves the ESP-IDF version from CMake using the new getEspIdfFromCMake utility, and extracts the major and minor version for use in constraints file selection. [1] [2]
• Determines the tools path by checking configuration parameters, environment variables, or defaults, ensuring the correct location for ESP-IDF tools is used.
• Checks for the existence of a version-specific pip constraints file and conditionally adds it to the pip install command to ensure package compatibility.
• Updates the pip install command to include the constraints argument if the constraints file is found, improving reliability of package installation.

General code improvements:

• Imports the new getEspIdfFromCMake utility and applies minor formatting changes for readability in function calls. [1] [2]

Fixes #1680

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Steps to test this pull request

Provide a list of steps to test changes in this PR and required output

1. Run the command "ESP-IDF Unit Test: Install ESP-IDF PyTest requirements"
2. Execute action. The Pytest should install pytest but comply with ESP-IDF constraints.
3. Observe results.

• Expected behaviour:
  The Pytest should install pytest but comply with ESP-IDF constraints.

• Expected output:
  The Pytest should install pytest but comply with ESP-IDF constraints.

How has this been tested?

Manual testing above.

Test Configuration:

• ESP-IDF Version: 5.5.1
• OS (Windows,Linux and macOS): macOS

Checklist

• PR Self Reviewed
• Applied Code formatting
• Added Documentation
• Added Unit Test
• Verified on all platforms - Windows,Linux and macOS

[github-actions]

Download the artifacts for this pull request:
You can test these changes by installing this VSIX by click menu View -> Command Palette..., type Install from VSIX and then select downloaded esp-idf-extension.vsix file to install the extension.

• esp-idf-extension.vsix.zip
  Espressif documentation preview

[radurentea]

LGTM

[Fabricio-ESP]

Confirmed Working.