Removes duplicate application dashboard list
Removes duplicate application dashboard list

I can't see a reason why there are two different lists for application
dashboards for Integration vs Staging / Prod [1]. These lists are mostly
the same, but have fallen out of sync as I assume people haven't
realised there are two lists.

In doing this, the following has changed for integration:

- Removed calculators dashboard as this is now retired

- Adds `show_postgres_stats`, `show_sidekiq_graphs` and `has_workers` to eligible apps

- Adds some Search API metrics: `search_latency_vs_request_count`,
  `completion_latency_vs_request_count`, `spelling_latency_vs_request_count`

[1]: https://github.com/alphagov/govuk-puppet/blob/22a0402b67cc3455ff36f9e514319994645613c5/hieradata_aws/common.yaml#L1189

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