Hide "Create Virtual Environment" when Python not installed

[Copilot]

Users without Python installations were shown "Create Virtual Environment" in the interpreter picker, leading to confusing failures. This prevented them from understanding why environment creation failed repeatedly.

Changes

• Python detection: Check system manager for available Python installations before rendering picker options
• Conditional UI: Show warning message when no Python detected; show create option only when Python exists
• Fallback preserved: "Browse..." option remains available in all cases for manual Python location

Implementation

Detection uses system manager ID to query for global Python installations:

const systemManager = managers.find((m) => m.id === 'ms-python.python:system');
const systemPythons = systemManager ? await systemManager.getEnvironments('all') : [];
const hasPython = systemPythons.length > 0;

if (hasPython) {
    items.push({
        label: Interpreter.createVirtualEnvironment,
        iconPath: new ThemeIcon('add'),
    });
} else {
    items.push({
        label: Interpreter.noPythonInstalled,
        description: Interpreter.noPythonInstalledDescription,
        iconPath: new ThemeIcon('warning'),
    });
}

Before: Browse... | Create Virtual Environment...
After (no Python): Browse... | ⚠️ No Python Detected
After (has Python): Browse... | Create Virtual Environment...

Original prompt

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This section details on the original issue you should resolve

<issue_title>Show warning that python isnt installed in select interpreter and/or create environment quick pick</issue_title>
<issue_description>Observed a user navigate to the Select Interpreter status bar item when a python wasnt select and they were shown Create Environment and Enter Interpreter path.

I dont think we should show Create Environment here unless one of the supported managers has a way to bring a Python in the process. It would be nice to also have a warning in this drop down that Python is not detected. Users got stuck in this process and just trying to create environments over and over again

</issue_description>

<agent_instructions>if a user goes to this menu:

• check to see if they have python installed like at all
• if they DON't show an error message about that
• if they do then the create virtual environment should be good!</agent_instructions>

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

• Fixes Show warning that python isnt installed in select interpreter and/or create environment quick pick #389

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