Fix: Restrict Set-ExecutionPolicy to Windows in PowerShell env activation

[Copilot]

Set-ExecutionPolicy was unconditionally prepended to PowerShell activation commands, causing Operation is not supported on this platform. errors on macOS/Linux where the command is not available.

Changes

• src/managers/common/utils.ts: Extracted buildPwshActivationCommands(ps1Path) helper that only emits Set-ExecutionPolicy -Scope Process -ExecutionPolicy RemoteSigned when isWindows() is true. On non-Windows, only & activate.ps1 is emitted. Also eliminates duplication between the Activate.ps1/activate.ps1 branches.

// Before: always emitted on all platforms
shellActivation.set(ShellConstants.PWSH, [
    { executable: 'Set-ExecutionPolicy', args: ['-Scope', 'Process', '-ExecutionPolicy', 'RemoteSigned'] },
    { executable: '&', args: [path.join(binDir, 'Activate.ps1')] },
]);

// After: Set-ExecutionPolicy only on Windows
function buildPwshActivationCommands(ps1Path: string): PythonCommandRunConfiguration[] {
    const commands: PythonCommandRunConfiguration[] = [];
    if (isWindows()) {
        commands.push({ executable: 'Set-ExecutionPolicy', args: ['-Scope', 'Process', '-ExecutionPolicy', 'RemoteSigned'] });
    }
    commands.push({ executable: '&', args: [ps1Path] });
    return commands;
}

• src/test/managers/common/utils.getShellActivationCommands.unit.test.ts: Adds tests asserting non-Windows PowerShell activation produces exactly one command (& activate.ps1) with no Set-ExecutionPolicy.

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