Simplified redis cloud flow

[manachyn]

This pull request refactors the Redis Cloud integration by removing the account entity and its associated functionality, streamlining the subscription management process, and enhancing the flexibility of subscription definitions. Key updates include the removal of account-related files, updates to subscription schemas, and improvements to the subscription synchronization logic.

Removal of account entity and related functionality:

• redis-cloud/account-sync.js: Entire file removed, eliminating functionality for retrieving payment methods and plans.
• redis-cloud/account.yaml: Removed the account entity definition and lifecycle configuration.
• redis-cloud/example.yaml: Removed the redis-account entity from the example stack.
• redis-cloud/MANIFEST: Removed references to account.yaml and account-sync.js.

Enhancements to subscription management:

• redis-cloud/subscription-sync.js: Added selectPlan and selectPaymentMethod functions to dynamically determine the plan ID and payment method ID based on subscription definitions. Updated the syncSubscription function to use these new utilities. [1] [2]
• redis-cloud/subscription.yaml: Expanded the subscription schema to include new fields like provider, region, redis_flex, and various support flags for additional configuration flexibility. [1] [2]
• redis-cloud/example.yaml: Updated the subscription example to reflect the new schema, replacing plan_id with dynamic configuration options such as size, provider, and region.

Documentation updates:

• redis-cloud/README.md: Updated usage instructions to reflect the removal of the account entity, simplified the deployment process, and clarified the creation of secrets and stack deployment steps.