[CLOUDGA-28934] Removed Connection Pooling feature flag from YBM-CLI.

[atharva-yb]

Tested locally without exporting Connection Pooling FF.

• Create

# ybm cluster create -h
Create a cluster

Usage:
  ybm cluster create [flags]

Flags:
      --cluster-name string            [REQUIRED] Name of the cluster.
....
      --enable-connection-pooling      [OPTIONAL] Enable connection pooling for the cluster during creation. Default false.
  -h, --help                           help for create

Global Flags:
  -a, --apiKey string      YugabyteDB Aeon account API key
....

• Modify Connection pooling status

# ybm cluster -h                                                                 
Manage cluster operations

Usage:
  ybm cluster [flags]
  ybm cluster [command]

Available Commands:
  cert               Get the root CA certificate
  connection-pooling Manage Connection Pooling for a cluster
  create             Create a cluster
  db-audit-logging   Configure Database Audit Logging for your Cluster.
....

• Describe cluster

# ybm cluster describe --cluster-name puppy-heavy-workload-lrc-aws --output=table
General
Name                           ID                                     Version          State     Health
puppy-heavy-workload-lrc-aws   00000000-0000-0000-0000-000000000000   2024.1.6.0-b53   ACTIVE    💚

Provider   Tier        Fault Tolerance   Nodes     Node Res.(Vcpu/Mem/DiskGB/IOPS)   Connection Pooling
AWS        Dedicated   ZONE, RF 3        6         4 / 16GB / 1300GB / 3000          ❌

....

[posriniv]

Looks good to me!