[Alerting dashboards] Update alerting dashboard tests due to fit and finish changes

[jowg-amazon]

Description

Updated alerting dashboard cypress tests due to fit and finish changes.

Issues Resolved

[List any issues this PR will resolve]

Check List

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[jowg-amazon]

Alerting tests are all passing locally

       Spec                                              Tests  Passing  Failing  Pending  Skipped  
  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ ✔  plugins/alerting-dashboards-plugin/      01:26        3        3        -        -        - │
  │    acknowledge_alerts_modal_spec.js                                                            │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      02:29        5        5        -        -        - │
  │    alert_spec.js                                                                               │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      01:30        2        2        -        -        - │
  │    alerts_dashboard_flyout_spec.js                                                             │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      01:09        4        4        -        -        - │
  │    bucket_level_monitor_spec.js                                                                │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      01:07        6        6        -        -        - │
  │    cluster_metrics_monitor_spec.js                                                             │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      00:39        2        2        -        -        - │
  │    composite_level_monitor_spec.js                                                             │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      01:37        5        5        -        -        - │
  │    document_level_monitor_spec.js                                                              │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      00:18        1        1        -        -        - │
  │    monitors_dashboard_spec.js                                                                  │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ ✔  plugins/alerting-dashboards-plugin/      01:25        8        8        -        -        - │
  │    query_level_monitor_spec.js                                                                 │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘
    ✔  All specs passed!                        11:43       36       36        -        -        -  

[AWSHurneyt]

Could this PR be backported to 2.18 as well please now that the branch has been cut?