SONAR-19977 add AppId to force auth via webhook

sonar-ws/src/main/java/org/sonarqube/ws/client/almintegrations/AlmIntegrationsService.java

         .setHeader("X-GitHub-Event", request.getGithubEventHeader())
         .setHeader("X-Hub-Signature", request.getGithubSignatureHeader())
         .setHeader("X-Hub-Signature-256", request.getGithubSignature256Header())
+        .setHeader("x-github-hook-installation-target-id", request.getGithubAppId())
         .setBody(request.getPayload())
         .setMediaType(MediaTypes.JSON)
     ).content();

sonar-ws/src/main/java/org/sonarqube/ws/client/almintegrations/SendGithubCodeScanningAlertWebhookPayloadRequest.java

 /**
  * This is part of the internal API.
  * This is a POST request.
+ *
  * @see <a href="https://next.sonarqube.com/sonarqube/web_api/api/alm_integrations/webhook_github">Further information about this action online (including a response example)</a>
  * @since 9.7
  */
   private String githubSignatureHeader;
   private String githubSignature256Header;
 
+  private String githubAppId;
+
   /**
    * This is a mandatory parameter.
    */
   public String getGithubSignature256Header() {
     return githubSignature256Header;
   }
+
+  public String getGithubAppId() {
+    return githubAppId;
+  }
+
+  public SendGithubCodeScanningAlertWebhookPayloadRequest setGithubAppId(String githubAppId) {
+    this.githubAppId = githubAppId;
+    return this;
+  }
 }