feat: add data-testid to SDK version dropdown, singleInterfaceIce and forceRelayCandidate switches (#78)

Enables blackbox-testing-webrtc to programmatically:
- Select SDK version (e.g. 2.25.26-beta.4) via select-sdk-version
- Toggle singleInterfaceIce via switch-single-interface-ice
- Toggle forceRelayCandidate via switch-force-relay-candidate

Author: lucasassisrosa

src/components/ClientOptions.tsx

@@ -463,6 +463,7 @@ const ClientOptions = () => {
                   </div>
                   <FormControl>
                     <Switch
+                      data-testid="switch-single-interface-ice"
                       checked={field.value}
                       onCheckedChange={field.onChange}
                     />
@@ -509,6 +510,7 @@ const ClientOptions = () => {
                   </div>
                   <FormControl>
                     <Switch
+                      data-testid="switch-force-relay-candidate"
                       checked={field.value}
                       onCheckedChange={field.onChange}
                     />

src/components/SDKVersionDropdown.tsx

@@ -118,7 +118,7 @@ const SDKVersionDropdown = () => {
   };
   return (
     <Select value={version} onValueChange={onVersionChange}>
-      <SelectTrigger className="w-[180px]">
+      <SelectTrigger className="w-[180px]" data-testid="select-sdk-version">
         <SelectValue placeholder="SDK version" />
       </SelectTrigger>
       <SelectContent>