feat: healthcheck for external services (#4048)

* chore: installed terminus package and scaffolded the health module

* feat: added healthcheck for database with prisma

* chore: renamed label from prisma to database in health check route

* chore: reverted target of hopp-old-backend service to prod

packages/hoppscotch-backend/src/health/health.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { HealthController } from './health.controller';
+import { PrismaModule } from 'src/prisma/prisma.module';
+import { TerminusModule } from '@nestjs/terminus';
+
+@Module({
+  imports: [PrismaModule, TerminusModule],
+  controllers: [HealthController],
+})
+export class HealthModule {}