chore(batch-exports): Improve batch export alerting by checking for missing runs

[rossgray]

Problem

We've had an issue recently where Temporal hasn't scheduled a workflow run for some reason and we didn't detect this.

Changes

Update existing monitoring job to also check for missing batch export runs.

We will log a warning message when this happens, which we can then create an alert for in alertmanager.

Does this work well for both Cloud and self-hosted?

it doesn't have an impact

How did you test this code?

Updated existing tests + added a new one

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: consuming input failed: query_wait_timeout posthog.batch_exports.service in <listcomp> View Issue

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