hack: replace fragile awk pipeline with 'go env GOARCH' in install.sh (#9000)

hack: use 'go env GOARCH' instead of fragile awk pipeline in install.sh

The previous 'go env | grep GOARCH | awk -F\'' pipeline is fragile:
it depends on the specific output format of 'go env' which can vary.
'go env GOARCH' is the canonical, documented way to read a single
Go environment variable and is simpler and more reliable.

Author: Ankitsinghsisodya

hack/install.sh

@@ -29,7 +29,7 @@ fi
 export SCALE_CHAOSDUCK_TO_ZERO=1
 export REPLICAS=1
 
-KO_ARCH=$(go env | grep GOARCH | awk -F\' '{print $2}')
+KO_ARCH=$(go env GOARCH)
 
 export KO_FLAGS=${KO_FLAGS:-"--platform=linux/$KO_ARCH"}