Work around activate.sh failure after cleaning (#2655)
Work around activate.sh failure after cleaning (#2655)

In the devcontainer, cleaning is causing a failure now that the pigweed
environment was moved outside the checkout (to fix docker/host checkout
sharing). Work around the issue by cleaning the environment as well.

fixes #2654
project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip