hardcode prod GTM id while we work out a better solution (#3013)

After bugs were found in PR 3001, this will point all environments to GTM. GTM will handle setting GA ID based on hostname

frontend/src/constants/environments.ts

@@ -8,10 +8,6 @@ const {
   API_URL,
   API_AUTH_TOKEN = "",
   NEXT_PUBLIC_BASE_URL,
-  // for deployed envs it will come from ECS task def env var
-  // it will not be populated locally, or in Jest or E2E tests
-  // if it is needed locally or tests, add it in .env.local or command line
-  NEXT_PUBLIC_GOOGLE_ANALYTICS_ID = "",
 } = process.env;
 
 // home for all interpreted server side environment variables
@@ -28,5 +24,5 @@ export const environment: { [key: string]: string } = {
   API_URL: API_URL || "",
   API_AUTH_TOKEN,
   NEXT_PUBLIC_BASE_URL: NEXT_PUBLIC_BASE_URL || "http://localhost:3000",
-  NEXT_PUBLIC_GOOGLE_ANALYTICS_ID,
+  NEXT_PUBLIC_GOOGLE_ANALYTICS_ID: "GTM-MV57HMHS",
 };