Update screenshots and api clients (#4967)

* Update oncokb ts clients

* Update screenshots after oncokb annotation updates

Author: alisman

end-to-end-test/remote/screenshots/reference/no_session_mutation_tab_element_chrome_1600x1000.png

@@ -889,7 +889,7 @@
           "application/json"
         ],
         "produces": [
-          "text/plain"
+          "text/plain;charset=UTF-8"
         ],
         "parameters": [
           {
@@ -978,7 +978,7 @@
           "application/json"
         ],
         "produces": [
-          "text/plain"
+          "text/plain;charset=UTF-8"
         ],
         "parameters": [
           {

end-to-end-test/remote/screenshots/reference/session_mutation_tab_element_chrome_1600x1000.png

@@ -2056,7 +2056,7 @@ export default class OncoKbAPI {
         let headers: any = {};
         let form: any = {};
         return new Promise(function(resolve, reject) {
-            headers['Accept'] = 'text/plain';
+            headers['Accept'] = 'text/plain;charset=UTF-8';
             headers['Content-Type'] = 'application/json';
 
             if (parameters['version'] !== undefined) {
@@ -2211,7 +2211,7 @@ export default class OncoKbAPI {
         let headers: any = {};
         let form: any = {};
         return new Promise(function(resolve, reject) {
-            headers['Accept'] = 'text/plain';
+            headers['Accept'] = 'text/plain;charset=UTF-8';
             headers['Content-Type'] = 'application/json';
 
             if (parameters['version'] !== undefined) {