Consider auto approving of file writes to /tmp

[Tyriar]

Copilot may want to run something like this:

npm run test:server:main 2>&1 | tee /tmp/test_output.log

This will not be auto approved currently because:

• tee isn't auto approved
• Even if it was, it's writing to /tmp which we don't allow anywhere atm

We should consider adding auto approve for tee as well as allowing writes to /tmp as part of chat.tools.terminal.blockDetectedFileWrites