fix(enterprise): alerts get-settings command hangs/times out

[joshrotenberg]

Problem

The enterprise alerts get-settings command hangs and eventually times out.

Steps to Reproduce

redisctl enterprise alerts get-settings

# Command hangs indefinitely or times out

Expected Behavior

Should return the alert settings configuration for the cluster.

Likely Causes

1. Incorrect endpoint path
2. Handler implementation issue
3. The endpoint might not exist in the current API version

Investigation Needed

• Verify the correct endpoint path in Redis Enterprise API docs
• Check if the endpoint exists: redisctl api enterprise get /v1/cluster/alerts/settings
• Review the handler implementation

Acceptance Criteria

• Command returns alert settings without hanging
• Proper error message if endpoint doesn't exist
• Add integration test for this command

Part of #315

[joshrotenberg]

This issue appears to be invalid. Testing shows that enterprise alerts settings-get works correctly and returns alert settings from the cluster configuration.

Tested with:

REDIS_ENTERPRISE_URL="https://localhost:9443" \
REDIS_ENTERPRISE_USER="admin@cluster.local" \
REDIS_ENTERPRISE_PASSWORD="Redis123!" \
REDIS_ENTERPRISE_INSECURE="true" \
cargo run --bin redisctl -- enterprise alerts settings-get

Returns valid alert settings JSON from /v1/cluster endpoint.