[nexus] re-enable sp_ereport_ingester a second time (#10201)

PR #8709 temporarily disabled the `sp_ereport_ingester` background task
in the config file for R16, as at the time, the Hubris task that
actually exported ereports to the control plane had not merged, and
trying to collect them would just result in Nexus logging a bunch of
errors. After the Hubris code was merged, PR #8838 removed the config
file changes that disabled the `sp_ereport_ingester` task, and all was
well...

...for exactly 35 days. Then, an unrelated PR, #9091 inadvertently [put
back the config][1] for disabling the background task, due to what
appears to be a bad merge. Whoops.

Therefore, this PR un-disables the `sp_ereport_ingester` background task
a _second_ time. Sigh.

[1]: 18058fc#diff-4bc8cb2586b5997322a5977452772052073f9c5392dd2a578b9d9930a2aedd72

Author: hawkw

smf/nexus/multi-sled/config-partial.toml

@@ -94,10 +94,6 @@ read_only_region_replacement_start.period_secs = 30
 alert_dispatcher.period_secs = 60
 webhook_deliverator.period_secs = 60
 sp_ereport_ingester.period_secs = 30
-# Disabled in R16, as the Hubris task that handles ereport ingestion requests
-# has not merged yet, and trying to ingest them will just result in Nexus
-# logging a bunch of errors.
-sp_ereport_ingester.disable = true
 # How frequently to check for a new fault management sitrep (made by any
 # Nexus).
 # This is cheap, so we should check frequently.

smf/nexus/single-sled/config-partial.toml

@@ -94,10 +94,6 @@ read_only_region_replacement_start.period_secs = 30
 alert_dispatcher.period_secs = 60
 webhook_deliverator.period_secs = 60
 sp_ereport_ingester.period_secs = 30
-# Disabled in R16, as the Hubris task that handles ereport ingestion requests
-# has not merged yet, and trying to ingest them will just result in Nexus
-# logging a bunch of errors.
-sp_ereport_ingester.disable = true
 # How frequently to check for a new fault management sitrep (made by any
 # Nexus).
 # This is cheap, so we should check frequently.