[VSC-1521] use idf tools export to get env vars

[brianignacio5]

Description

Use idf_tools.py export --format key-value to get ESP-IDF variables required in environment variables.

This should fix missing ESP_IDF_VERSION from extension tasks and use PATH from idf_tools.py (which is already done but could replace extension implementation.)

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

Probably the best way to verify that variables are present is to open ESP-IDF: Open ESP-IDF Terminal and do echo $ESP_IDF_VERSION or other environment variable from idf_tools.py export output.

You can also test with any command like ESP-IDF: Build your project but harder to see if variables are available.

• Expected behaviour:

All variables from idf_tools.py export --format key-value should be available in extension commands like ESP-IDF: Open ESP-IDF Terminal

Test Configuration:

• ESP-IDF Version: 4.4 , 4.4.8, 5.0.4 5.4
• OS (Windows,Linux and macOS): macOS Windows

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]

I installed the extension and I keep getting error when attempting to build the example project.

Error after build.txt

[brianignacio5]

I have updated the PR with changes to fix this issue. Please take a look again @Fabricio-ESP

[radurentea]

LGTM

I would have liked if the ESP-IDF version would return the entire version, but I see this is what is being returned by the "export" command. I've tested it with esp idf "5.3.1" version and the version I see in doctor command is "5.3"

[Fabricio-ESP]

Confirmed working on Windows and Linux, running IDF 5.0, 5.3 and 5.4