Remove Appspot-facing proxy-go instances
Currently we run 7 round-the-clock instances of proxy-go:
- snowflake-proxy-restartless
- snowflake-proxy-17h
- snowflake-proxy-23h
- snowflake-proxy-29h
- snowflake-proxy-standalone-17h
- snowflake-proxy-standalone-23h
- snowflake-proxy-standalone-29h
snowflake-proxy-restartless is an experiment for #25688 (moved), so put it aside. Of the remaining 6, the only difference is what broker they correspond with:
- 3 for !https://snowflake-reg.appspot.com/ (the old App Engine–bound broker)
- 3 for !https://snowflake-broker.bamsoftware.com/ (the current standalone broker)
We fully switched away from the App Engine broker [[comment:9:ticket:22874|10 months ago]]. Nothing in the source code refers to snowflake-reg.appspot.com any longer. So I propose we stop running the 3 instances that use the old App Engine broker:
- snowflake-proxy-17h
- snowflake-proxy-23h
- snowflake-proxy-29h
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