Gauge: Fix issues found during bug bash (#115740)

* fix warning for VizRepeater styles

* Gauge: Update test dashboard to round two of the segment panels to whole numbers

* Gauge: E2E tests

* add test for sparklines

* Gauge: Change inner glow to be friendlier to our a11y tests

* remove unused CODEOWNER declaration

* expose text mode so that old displayName usage is somewhat preserved

* update migrations to use the value_and_text mode if displayName has a non-empty value

* more test cases

* update unit tests for fixture updates

apps/dashboard/pkg/migration/testdata/dev-dashboards-output/panel-gauge/gauge_tests.v42.json

@@ -628,6 +628,20 @@
         }
       ],
       "title": "Only nulls and no user set min \u0026 max",
+      "transformations": [
+        {
+          "id": "convertFieldType",
+          "options":  {
+            "conversions": [
+              {
+                "destinationType": "number",
+                "targetField": "A-series"
+              }
+            ],
+            "fields": {}
+          }
+        }
+      ],
       "type": "gauge"
     },
     {
@@ -1179,4 +1193,4 @@
   "title": "Panel Tests - Gauge",
   "uid": "_5rDmaQiz",
   "weekStart": ""
-}
+}

apps/dashboard/pkg/migration/testdata/dev-dashboards-output/panel-gauge/gauge_tests_new.v42.json

@@ -1760,6 +1760,22 @@
           "startValue": 0
         }
       ],
+      "transformations": [
+        {
+          "id": "calculateField",
+          "options": {
+            "mode": "unary",
+            "reduce": {
+              "reducer": "sum"
+            },
+            "replaceFields": true,
+            "unary": {
+              "operator": "round",
+              "fieldName": "A-series"
+            }
+          }
+        }
+      ],
       "title": "Active gateways",
       "type": "radialbar"
     },
@@ -1843,6 +1859,22 @@
           "startValue": 0
         }
       ],
+      "transformations": [
+        {
+          "id": "calculateField",
+          "options": {
+            "mode": "unary",
+            "reduce": {
+              "reducer": "sum"
+            },
+            "replaceFields": true,
+            "unary": {
+              "operator": "round",
+              "fieldName": "A-series"
+            }
+          }
+        }
+      ],
       "title": "Active pods",
       "type": "radialbar"
     },

apps/dashboard/pkg/migration/testdata/dev-dashboards-output/panel-gauge/gauge_tests_old_to_new.v42.json

@@ -485,6 +485,7 @@
       },
       "id": 12,
       "options": {
+        "displayName": "My gauge",
         "minVizHeight": 75,
         "minVizWidth": 75,
         "orientation": "auto",