[ReleasePR app] Correct Probe enums (#2355)

Create to sync Azure/azure-rest-api-specs#18839
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/app?expand=1)

Author: msftbot[bot]

schemas/2022-01-01-preview/Microsoft.App.json

@@ -904,8 +904,8 @@
             {
               "type": "string",
               "enum": [
-                "multiple",
-                "single"
+                "Multiple",
+                "Single"
               ]
             },
             {
@@ -1158,9 +1158,9 @@
             {
               "type": "string",
               "enum": [
-                "liveness",
-                "readiness",
-                "startup"
+                "Liveness",
+                "Readiness",
+                "Startup"
               ]
             },
             {
@@ -1209,7 +1209,18 @@
           "description": "Name or number of the port to access on the container. Number must be in the range 1 to 65535. Name must be an IANA_SVC_NAME."
         },
         "scheme": {
-          "type": "string",
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "HTTP",
+                "HTTPS"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "Scheme to use for connecting to the host. Defaults to HTTP."
         }
       },

schemas/2022-03-01/Microsoft.App.json

@@ -904,8 +904,8 @@
             {
               "type": "string",
               "enum": [
-                "multiple",
-                "single"
+                "Multiple",
+                "Single"
               ]
             },
             {
@@ -1158,9 +1158,9 @@
             {
               "type": "string",
               "enum": [
-                "liveness",
-                "readiness",
-                "startup"
+                "Liveness",
+                "Readiness",
+                "Startup"
               ]
             },
             {
@@ -1209,7 +1209,18 @@
           "description": "Name or number of the port to access on the container. Number must be in the range 1 to 65535. Name must be an IANA_SVC_NAME."
         },
         "scheme": {
-          "type": "string",
+          "oneOf": [
+            {
+              "type": "string",
+              "enum": [
+                "HTTP",
+                "HTTPS"
+              ]
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "Scheme to use for connecting to the host. Defaults to HTTP."
         }
       },