Fix "Run Python File" executing in Python REPL instead of shell

[Copilot]

Problem

When a user has a Python REPL active in a terminal (after running python) and then clicks "Run Python File", the command gets sent to the Python interpreter instead of creating a new shell terminal. This causes the file execution command to be typed into the Python REPL rather than executed at the shell level.

Root Cause

The terminal service was reusing existing terminals without checking if they were currently in Python REPL mode. The executeFile method would send commands to whatever terminal was available, regardless of its current state.

Solution

Modified TerminalCodeExecutionProvider.executeFile() to detect when a terminal is in Python REPL mode and force creation of a new terminal for file execution in that case.

Key Changes

1. Added REPL state detection in shouldForceNewTerminalForFileExecution() method:

   • Checks if replActive is true (indicating Python REPL is running)
   • Forces newTerminalPerFile: true when REPL is active
   • Preserves existing behavior when not in REPL mode

2. Modified executeFile() method to use the REPL detection logic before terminal operations

3. Added comprehensive test to verify the fix works correctly

Example Scenario

Before:

$ python
>>> # User clicks "Run Python File" button
>>> python /path/to/script.py  # This gets typed into Python REPL (wrong!)

After:

$ python
>>> # User clicks "Run Python File" button
# New terminal opens automatically:
$ python /path/to/script.py  # Executes in new shell terminal (correct!)

Compatibility

• ✅ Zero breaking changes - existing behavior preserved when not in REPL
• ✅ Respects existing newTerminalPerFile setting if already enabled
• ✅ Automatically applies to Django Shell execution (inherits from base class)
• ✅ All existing tests pass + new test coverage added

Fixes #25159.

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