This PR adds the executable path information to Python environment descriptions in the environment picker dropdown. Previously, the paths were removed to reduce noise, but based on user feedback, this information is useful for distinguishing between similarly-named environments.

Changes

• Updated the environment picker functions in src/common/pickers/environments.ts to display the executable path in the description field when no description is available.
• The path is only shown when there is no existing description, maintaining compatibility with environments that already have meaningful descriptions.
• Modified all three occurrences of environment item creation in the picker to ensure consistent behavior:
  • pickEnvironment function - main environments list
  • pickEnvironment function - recommended environment section
  • pickEnvironmentFrom function - direct environment selection

Before

Environment entries showed just the name without path information:

After

Environment entries now show the executable path in the description field, making it easier to distinguish between multiple environments with the same version.

Fixes #422.

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