do not use shell integration for Python subshell if Python setting is disabled #24418
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Resolves: #24422
This PR will resolve KeyboardInterrupt from happening when shell integration is enabled on upstream shell but not on the sub-shell (Python)
If the user has explicitly set their Python shell integration setting to false,
then do not use shell integration inside the sub-shell (Python Terminal REPL in this case),
regardless of upper shell integration status (Terminal shell integration setting in vscode).
We should still be safe from manual installation of shell integration with the setting disabled(https://code.visualstudio.com/docs/terminal/shell-integration#_manual-installation)
since we are still reading the value of terminal.shellIntegration, and looking at Python's shell integration setting first to begin with.