refactory to move trim/apply default into schema.go (#33754)

* refactory to move trim/apply default into schema.go

* fix comments

* move schema test outside of load folder

pkg/schema/load/testdata/artifacts/dashboards/trimdefault/test1

@@ -1,35 +0,0 @@
-Verifies common usecases for trimdefault/applydefault functions:
-* Basic cases
-* Real dashboard
-
--- CUE --
-{ 
-  id?: number
-  uid: string
-  gnetId?: string
-  style: *"light" | "dark"
-  timezone?: *"browser" | "utc"
-  editable: bool | *true
-  schemaVersion: number | *25
-  version?: number
-  graphTooltip: >=0 & <=2 | *0
-}
-
--- Full --
-{
-  "id": 42,
-  "uid": "emal8gQMz",
-  "style": "light",
-  "editable": true,
-  "schemaVersion": 27,
-  "version": 2,
-  "graphTooltip": 0
-}
-
--- Trimed --
-{
-  "id": 42,
-  "uid": "emal8gQMz",
-  "schemaVersion": 27,
-  "version": 2
-}

pkg/schema/load/testdata/artifacts/dashboards/trimdefault/test2

@@ -1,41 +0,0 @@
-Verifies common usecases for trimdefault/applydefault functions:
-* Basic cases
-* Real dashboard
-
--- CUE --
-{ 
-  timepicker?: {
-      collapse: bool | *false
-      enable: bool | *true
-      hidden: bool | *false
-      refresh_intervals: [...string] | *["5s", "10s", "30s", "1m", "5m", "15m", "30m", "1h", "2h", "1d"]
-  }
-}
-
--- Full --
-{
-  "timepicker": {
-    "collapse": true,
-    "enable":true,
-    "hidden":false,
-    "refresh_intervals":[
-      "5s",
-      "10s",
-      "30s",
-      "1m",
-      "5m",
-      "15m",
-      "30m",
-      "1h",
-      "2h",
-      "1d"
-    ]
-  }
-}
-
--- Trimed --
-{
-  "timepicker": {
-    "collapse": true
-  }
-}

pkg/schema/load/testdata/artifacts/dashboards/trimdefault/test3

@@ -1,46 +0,0 @@
-Verifies common usecases for trimdefault/applydefault functions:
-* Nested struct
-* Simple array
-
--- CUE --
-{ 
-  annotations?: list: [...{
-      builtIn: number | *0
-      datasource: string
-      enable?: bool | *true
-      hide?: bool | *false
-      iconColor?: string
-      name?: string
-      type: string | *"dashboard"
-      rawQuery?: string
-      showIn:   number | *0
-  }]
-}
-
--- Full --
-{
-  "annotations": {
-    "list": [
-      {
-        "builtIn": 1,
-        "datasource": "-- Grafana --",
-        "name": "Annotations & Alerts",
-        "type": "dashboard",
-        "showIn": 0
-      }
-    ]
-  }
-}
-
--- Trimed --
-{
-  "annotations": {
-    "list": [
-      {
-        "builtIn": 1,
-        "datasource": "-- Grafana --",
-        "name": "Annotations & Alerts"
-      }
-    ]
-  }
-}

pkg/schema/load/testdata/artifacts/dashboards/trimdefault/test4

@@ -1,73 +0,0 @@
-Verifies common usecases for trimdefault/applydefault functions:
-* open structure should be kept when fields not present
-
--- CUE --
-{ 
-  templating?: list: [...{...}]
-}
-
--- Full --
-{
-  "templating": {
-    "list": [
-      {
-        "allValue": null,
-        "current": {
-            "text": "America",
-            "value": "America"
-        },
-        "datasource": "gdev-postgres",
-        "definition": "",
-        "hide": 0,
-        "includeAll": false,
-        "label": "Datacenter",
-        "multi": false,
-        "name": "datacenter",
-        "options": [],
-        "query": "SELECT DISTINCT datacenter FROM grafana_metric",
-        "refresh": 1,
-        "regex": "",
-        "skipUrlSync": false,
-        "sort": 1,
-        "tagValuesQuery": "",
-        "tags": [],
-        "tagsQuery": "",
-        "type": "query",
-        "useTags": false
-      }
-    ]
-  }
-}
-
--- Trimed --
-{
-  "templating": {
-    "list": [
-      {
-        "allValue": null,
-        "current": {
-            "text": "America",
-            "value": "America"
-        },
-        "datasource": "gdev-postgres",
-        "definition": "",
-        "hide": 0,
-        "includeAll": false,
-        "label": "Datacenter",
-        "multi": false,
-        "name": "datacenter",
-        "options": [],
-        "query": "SELECT DISTINCT datacenter FROM grafana_metric",
-        "refresh": 1,
-        "regex": "",
-        "skipUrlSync": false,
-        "sort": 1,
-        "tagValuesQuery": "",
-        "tags": [],
-        "tagsQuery": "",
-        "type": "query",
-        "useTags": false
-      }
-    ]
-  }
-}