[Security Solutions] Small telemetry fixes

[FrankHassanabad]

Summary

Small fixes and just a few docs to clarify things. I might be wrong on what I'm doing, so please let me know.

Looking at the telemetry data from servers I see things like this (I made this up, not real data, but the shape of the data is the same as what we see on the servers):

"securitySolution:overview" : {
  "clicks_total" : 420,
  "minutes_on_screen_total" : 55.58454999999998,
  "viewId" : "main",
  "clicks_7_days" : 0,
  "clicks_90_days" : 0,
  "appId" : "securitySolution:overview",
  "minutes_on_screen_7_days" : 0,
  "minutes_on_screen_30_days" : 0,
  "clicks_30_days" : 0,
  "minutes_on_screen_90_days" : 0
},

and I also see the views which is 👍 what I would make the dashboards from ... So not for sure if the structure above this is legacy. I could not get the shape of data above to happen locally. However, this shape below seems better and what I would create dashboards from.

"securitySolution" : {
  "clicks_total" : 420,
  "minutes_on_screen_total" : 2.90670000000006,
  "viewId" : "main",
  "clicks_7_days" : 70,
  "clicks_90_days" : 370,
  "appId" : "securitySolution",
  "minutes_on_screen_7_days" : 104.62756666666667,
  "minutes_on_screen_30_days" : 121.61288333333334,
  "clicks_30_days" : 121,
  "minutes_on_screen_90_days" : 250.55426666666665,
  "views" : [
    {
      "clicks_total" : 8,
      "minutes_on_screen_total" : 5.709183333333334,
      "viewId" : "overview",
      "clicks_7_days" : 0,
      "clicks_90_days" : 6,
      "appId" : "securitySolution",
      "minutes_on_screen_7_days" : 0,
      "minutes_on_screen_30_days" : 0.5038833333333333,
      "clicks_30_days" : 0,
      "minutes_on_screen_90_days" : 6.565383333333333
    },

With this new key of "securitySolutionUI" I don't see keys like securitySolutionUI:overview but I do see the views like above so let me know if changing the keys here in some areas are a mistake or not or if this is not the right thing to do.

Ref to earlier PR with the new key of securitySolutionUI from APP_ID changing:
#113573

[afharo]

Thank you for this change @FrankHassanabad

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Metrics [docs]

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cc @FrankHassanabad

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