devtools/oncall: increase the timeout for the debug command
devtools/oncall: increase the timeout for the debug command

This should hopefully give it enough time (the duration of "debug stats
read devmgr/apps/*/*/*/stats/system/metadata/build.[TPUM]*" has
increased from 0.5s to over 1 minute with the RPC protocol change.)

Depends on https://vanadium-review.googlesource.com/#/c/17603 for making
the rpc timeout flag-configurable in the debug tool.

MultiPart: 2/2

Change-Id: Ic8c242ebe14bb8626caa95ba09950e74a9b5e105

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