Tweak bulk sync settings (#5009)

# What this PR does
Adjust default sync settings to reduce amount processing at the same
time as well as reduce down time between batches.

## Which issue(s) this PR closes

Related to [issue link here]

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## Checklist

- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
    show up in the autogenerated release notes.

engine/settings/base.py

@@ -964,6 +964,6 @@ class BrokerTypes:
 
 ACKNOWLEDGE_REMINDER_TASK_EXPIRY_DAYS = os.environ.get("ACKNOWLEDGE_REMINDER_TASK_EXPIRY_DAYS", default=14)
 
-SYNC_V2_MAX_TASKS = getenv_integer("SYNC_V2_MAX_TASKS", 10)
-SYNC_V2_PERIOD_SECONDS = getenv_integer("SYNC_V2_PERIOD_SECONDS", 300)
+SYNC_V2_MAX_TASKS = getenv_integer("SYNC_V2_MAX_TASKS", 6)
+SYNC_V2_PERIOD_SECONDS = getenv_integer("SYNC_V2_PERIOD_SECONDS", 240)
 SYNC_V2_BATCH_SIZE = getenv_integer("SYNC_V2_BATCH_SIZE", 500)