[VSC-1542] do not duplicate python in path env var

[brianignacio5]

Description

Update PATH modification function (src/utils.ts appendIdfAndToolsToPath) to avoid python_env duplication in env PATH.

Should fix # error in terminal and using bat scripts on Windows.

Fixes #1369

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

1. Click on "ESP-IDF: Open ESP-IDF Terminal".
2. Running a bat script such as

idf.py build
idf.py fullclean
idf.py build
idf.py fullclean

4. Observe results. No errors should be produced.

• Expected behaviour: No errors on vscode terminal on Windows

• Expected output:

How has this been tested?

Manual testing on Windows as above.

Test Configuration:

• ESP-IDF Version: 5.3.2
• OS (Windows,Linux and macOS): Windows 11

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

[Fabricio-ESP]

Confirmed the Path is no longer duplicated after the change.
With this change I can run bat files in the VSCode terminal (Powershell and Command Prompt)