[TT-13375] Improved Upstream Auth validation rules (#6694)

### **User description**
<details open>
<summary><a href="https://tyktech.atlassian.net/browse/TT-13375"
title="TT-13375" target="_blank">TT-13375</a></summary>
  <br />
  <table>
    <tr>
      <th>Summary</th>
      <td>Validate Upstream Auth settings</td>
    </tr>
    <tr>
      <th>Type</th>
      <td>
<img alt="Story"
src="https://tyktech.atlassian.net/rest/api/2/universal_avatar/view/type/issuetype/avatar/10315?size=medium"
/>
        Story
      </td>
    </tr>
    <tr>
      <th>Status</th>
      <td>Ready for Testing</td>
    </tr>
    <tr>
      <th>Points</th>
      <td>N/A</td>
    </tr>
    <tr>
      <th>Labels</th>
      <td>-</td>
    </tr>
  </table>
</details>
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---

https://tyktech.atlassian.net/browse/TT-13375

## Description

Made Upstream Auth basic auth fields required: pwd, username and header
Made Upstream Oauth enabled and allowedAuthorizeTypes required


___

### **PR Type**
enhancement


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### **Description**
- Enhanced validation rules for Upstream Basic Authentication by making
`username` and `password` fields required.
- Changed the `headerName` field to `header` in
`X-Tyk-UpstreamBasicAuthentication`, referencing `X-Tyk-AuthSource`.
- Updated `X-Tyk-UpstreamOAuth` to require `allowedAuthorizeTypes` and
allow `extraMetadata` to be `null`.



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### **Changes walkthrough** 📝
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
  <td>
    <details>
<summary><strong>x-tyk-api-gateway.json</strong><dd><code>Enhance
validation rules for Upstream Auth configurations</code></dd></summary>
<hr>

apidef/oas/schema/x-tyk-api-gateway.json

<li>Made <code>username</code> and <code>password</code> fields required
in <br><code>X-Tyk-UpstreamBasicAuthentication</code>.<br> <li> Changed
<code>headerName</code> to <code>header</code> with a reference to
<code>X-Tyk-AuthSource</code>.<br> <li> Made
<code>allowedAuthorizeTypes</code> required in
<code>X-Tyk-UpstreamOAuth</code>.<br> <li> Allowed
<code>extraMetadata</code> to be <code>null</code> in
<code>X-Tyk-UpstreamOAuth</code>.<br>


</details>


  </td>
<td><a
href="https://github.com/TykTechnologies/tyk/pull/6694/files#diff-78828969c0c04cc1a776dfc93a8bad3c499a8c83e6169f83e96d090bed3e7dd0">+23/-7</a>&nbsp;
&nbsp; </td>

</tr>                    
</table></td></tr></tr></tbody></table>

___

> 💡 **PR-Agent usage**: Comment `/help "your question"` on any pull
request to receive relevant information

apidef/oas/schema/x-tyk-api-gateway.json

@@ -2022,8 +2022,8 @@
         "enabled": {
           "type": "boolean"
         },
-        "headerName": {
-          "type": "string"
+        "header": {
+          "$ref": "#/definitions/X-Tyk-AuthSource"
         },
         "username": {
           "type": "string"
@@ -2033,7 +2033,9 @@
         }
       },
       "required": [
-        "enabled"
+        "enabled",
+        "username",
+        "password"
       ]
     },
     "X-Tyk-UpstreamOAuth": {
@@ -2043,7 +2045,10 @@
           "type": "boolean"
         },
         "allowedAuthorizeTypes": {
-          "type": ["array", "null"],
+          "type": [
+            "array",
+            "null"
+          ],
           "items": {
             "type": "string",
             "enum": [
@@ -2075,7 +2080,10 @@
               "$ref": "#/definitions/X-Tyk-AuthSource"
             },
             "extraMetadata": {
-              "type": "array"
+              "type": [
+                "array",
+                "null"
+              ]
             }
           },
           "required": [
@@ -2112,7 +2120,10 @@
               "$ref": "#/definitions/X-Tyk-AuthSource"
             },
             "extraMetadata": {
-              "type": "array"
+              "type": [
+                "array",
+                "null"
+              ]
             }
           },
           "required": [
@@ -2123,7 +2134,12 @@
             "password"
           ]
         }
-      }
+      },
+      "required": [
+        "enabled",
+        "allowedAuthorizeTypes"
+      ]
     }
+
   }
 }