Add helm upgrade best practice [HAS BUG]

[Josipmrden]

Add best practice for helm upgrade.
Current version has a bug:

Defaulted container "memgraph-coordinator" out of: memgraph-coordinator, init (init), init-sysctl (init)
[2025-07-02 09:36:02.263] [warning] The auth-module-executable flag is deprecated and superseded by auth-module-mappings. To switch to the up-to-date flag, start Memgraph with auth-module-mappings=basic:{your module's path}.
[2025-07-02 09:36:02.263] [warning] The bolt_session_inactivity_timeout flag is deprecated. The feature has been removed, inactivity timeout is not supported as of v3.0.
[2025-07-02 09:36:02.263] [warning] storage_parallel_index_recovery flag is deprecated. Check storage_mode_parallel_schema_recovery for more details.
[2025-07-02 09:36:02.265] [warning] The auth-module-executable flag is deprecated and superseded by auth-module-mappings. To switch to the up-to-date flag, start Memgraph with auth-module-mappings=basic:{your module's path}.
[2025-07-02 09:36:02.265] [warning] The bolt_session_inactivity_timeout flag is deprecated. The feature has been removed, inactivity timeout is not supported as of v3.0.
[2025-07-02 09:36:02.265] [warning] storage_parallel_index_recovery flag is deprecated. Check storage_mode_parallel_schema_recovery for more details.
You are running Memgraph v3.3.0
To get started with Memgraph, visit https://memgr.ph/start
[2025-07-02 09:36:02.307] [memgraph_log] [info] config recover on startup true, flags true
[2025-07-02 09:36:02.364] [memgraph_log] [trace] Coordinator will be initialized using flags.
[2025-07-02 09:36:02.391] [memgraph_log] [info] Replication configuration will be stored and will be automatically restored in case of a crash.
[2025-07-02 09:36:02.391] [memgraph_log] [debug] Cannot find data needed for restore replication role in persisted metadata.
[2025-07-02 09:36:02.391] [memgraph_log] [trace] Creating coordinator state.
[2025-07-02 09:36:02.392] [memgraph_log] [trace] [RpcServer] register ShowInstancesReq -> ShowInstancesRes
[2025-07-02 09:36:02.392] [memgraph_log] [info] Starting 1 RPC workers
[2025-07-02 09:36:02.392] [memgraph_log] [info] RPC server is fully armed and operational
[2025-07-02 09:36:02.392] [memgraph_log] [info] RPC listening on 0.0.0.0:10000
[2025-07-02 09:36:02.421] [memgraph_log] [critical] Failed to deserialize snapshot with id: snapshot_id_5. Error: [json.exception.out_of_range.403] key 'cluster_state' not found
[json.exception.out_of_range.403] key 'cluster_state' not found