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monitoring: add WildcardAllValue and docs

Administrator requested to merge fix-exeuctor-dashboard into main

Created by: bobheadxi

The generated Grafana 'all' value introduced in https://github.com/sourcegraph/sourcegraph/pull/29481 does not work very well for all cases, especially for OptionsQuery where we can get a huge result set.

This PR creates an explicit option, WildcardAllValue, along with documentation on when and why to use it as well as why we don't use a wildcard by default.

Test plan

sg.overwrite.yaml:

commands:
  prometheus:
    install: |
      gcloud container clusters get-credentials cloud --zone us-central1-f --project sourcegraph-dev
    cmd: |
      kubectl port-forward svc/prometheus -n prod 9090:30090
sg start monitoring

Set to 12 hours, go to Executor -> Executor: Compute instance metrics

image

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