Add "Don't Show Again" option to environment file notification

[Copilot]

The notification warning users when python.terminal.useEnvFile is false repeatedly appears on every .env file change, with no way to dismiss it permanently.

Changes

• Localization: Added dontShowAgain string to Common namespace in src/common/localize.ts

• Notification logic (src/features/terminal/terminalEnvVarInjector.ts):

  • Introduced showEnvFileNotification() method that checks global persistent state before displaying
  • Added "Don't Show Again" button to showInformationMessage call
  • Stores user preference in global state with key dontShowEnvFileNotification
  • Replaced direct window.showInformationMessage call with wrapped API (windowApis.showInformationMessage)

• added button to open settings ui from popup

• Tests: Created terminalEnvVarInjectorNotification.unit.test.ts with coverage for notification display, dismissal behavior, and state persistence

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Python Environments] Environment file pop-up</issue_title>
<issue_description>
Type: Feature Request

Every time a .env file is created/edited anywhere in the workspace, and python.terminal.useEnvFile is false, a pop-up comes up explaining that environment injection is disabled. It would be good if this prompt had a "Don't show again" button, as it can happen quite frequently.

Environment Information

Extension Version: 1.16.0
Python Extension Version: 2026.0.0

Registered Environment Managers (3):
  - ms-python.python:system (Global)
  - ms-python.python:venv (venv)
  - ms-python.python:pipenv (Pipenv)

Total Available Environments: 4
Environment Details:
  1. Python 3.14.0 (3.14.0.final.0) - /usr/local/bin/python
  2. Python 3.13.5 (3.13.5.final.0) - /bin/python3
  3. Python 3.13.5 (3.13.5.final.0) - /usr/bin/python3
  4. my-project (3.14.0) (3.14.0.final.0) - /workspaces/my-project/.venv/bin/python

Python Projects (1):
  1. /workspaces/my-project
     Environment: my-project (3.14.0)

Extension Settings:
  Default Environment Manager: ms-python.python:venv
  Default Package Manager: ms-python.python:pip
Auto-activation is "shellStartup". Activation based on first 'py-env.terminal.autoActivationType' setting which is 'shellStartup' and 'python.terminal.activateEnvironment' if the first is undefined which is 'true'.

Extension version: 1.16.0
VS Code version: Code 1.108.0 (94e8ae2b28cb5cc932b86e1070569c4463565c37, 2026-01-08T13:53:10.781Z)
OS version: Windows_NT x64 10.0.26200
Modes:
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2

Comments on the Issue (you are @copilot in this section)

@eleanorjboyd great point!

• Fixes [Python Environments] Environment file pop-up #1092

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