Cleanup unused deployment secrets & args (#2698)

## Description:

* Remove unused otel creds
* Remove unused R2 creds
* remove left-over BASIC_AUTH
* Generate an admin token on startup
* Removed kick_player since lobby creators already have ability to kick
player

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/configuration/Config.ts

@@ -45,10 +45,6 @@ export interface ServerConfig {
   adminHeader(): string;
   // Only available on the server
   gitCommit(): string;
-  r2Bucket(): string;
-  r2Endpoint(): string;
-  r2AccessKey(): string;
-  r2SecretKey(): string;
   apiKey(): string;
   otelEndpoint(): string;
   otelAuthHeader(): string;

src/core/configuration/DefaultConfig.ts

@@ -141,19 +141,6 @@ export abstract class DefaultServerConfig implements ServerConfig {
   gitCommit(): string {
     return process.env.GIT_COMMIT ?? "";
   }
-  r2Endpoint(): string {
-    return `https://${process.env.CF_ACCOUNT_ID}.r2.cloudflarestorage.com`;
-  }
-  r2AccessKey(): string {
-    return process.env.R2_ACCESS_KEY ?? "";
-  }
-  r2SecretKey(): string {
-    return process.env.R2_SECRET_KEY ?? "";
-  }
-
-  r2Bucket(): string {
-    return process.env.R2_BUCKET ?? "";
-  }
 
   apiKey(): string {
     return process.env.API_KEY ?? "";
@@ -163,7 +150,11 @@ export abstract class DefaultServerConfig implements ServerConfig {
     return "x-admin-key";
   }
   adminToken(): string {
-    return process.env.ADMIN_TOKEN ?? "dummy-admin-token";
+    const token = process.env.ADMIN_TOKEN;
+    if (!token) {
+      throw new Error("ADMIN_TOKEN not set");
+    }
+    return token;
   }
   abstract numWorkers(): number;
   abstract env(): GameEnv;