[2.3.x backport] PPS: Be more careful about k8s errors during RC updates #8264
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Backport of #8244
promutil: also log outgoing http requests
PPS master: don't fail the pipeline because of context canceled / deadline exceeded errors
pps: side effects: add stringification of side effects
pps: pipelineController: return description of failing side effect
pps: pipeline controller: log more about scaling; prefix all messages with "PPS master"
promutil: make http logs less verbose (PPS spams the heck out of k8s while idle; we have metrics to watch those)
pps: pipeline controller: add some more information in debug logs during scale up
promutil: fix lint