Ensure clients can handle empty oneOf objects (#2702)

* handle empty oneof

* handle empty object matches

* lint

* Regenerate client from commit 60bc9127 of spec repo

---------

Co-authored-by: Sherzod Karimov <[email protected]>
Co-authored-by: api-clients-generation-pipeline[bot] <54105614+api-clients-generation-pipeline[bot]@users.noreply.github.com>
Co-authored-by: ci.datadog-api-spec <[email protected]> 2de9c6c

Author: api-clients-generation-pipeline[bot]

src/github.com/DataDog/datadog-api-client-go/v2/api/datadog/index.html

@@ -79,7 +79,7 @@ <h2>
 	<td></td>
 	<td align="right">14700</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.471337373 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -88,7 +88,7 @@ <h2>
 	<td></td>
 	<td align="right">18056</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.471337373 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -97,7 +97,7 @@ <h2>
 	<td></td>
 	<td align="right">622</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.471337373 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -106,7 +106,7 @@ <h2>
 	<td></td>
 	<td align="right">633</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.472337375 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -115,7 +115,7 @@ <h2>
 	<td></td>
 	<td align="right">405</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.472337375 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -124,7 +124,7 @@ <h2>
 	<td></td>
 	<td align="right">12924</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.472337375 +0000 UTC</td>
 </tr>
 
 <tr>
@@ -133,7 +133,7 @@ <h2>
 	<td></td>
 	<td align="right">589</td>
 	<td></td>
-	<td align="left">2024-09-30 14:34:15.16206878 +0000 UTC</td>
+	<td align="left">2024-09-30 15:10:23.472337375 +0000 UTC</td>
 </tr>