TBR: Revert "devtools: Bump timeout for v23-proxy-integration-test to 30 min."
TBR: Revert "devtools: Bump timeout for v23-proxy-integration-test to 30 min."

This reverts commit 523b578f47c2efa02f7980f869c5ff6c46b6f674.

The issue in https://github.com/vanadium/build/issues/21 does not seem to be timeout-related.  I'm reverting this CL so that we don't have to wait 30 min to see the result when the test hangs.

Change-Id: I023add56ac4f294dc57e722fbcb138ef2ddc5d51

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools