fix(enterprise): debug-info list command hangs/times out

[joshrotenberg]

Problem

The enterprise debug-info list command hangs and eventually times out.

Steps to Reproduce

redisctl enterprise debug-info list

# Command hangs indefinitely or times out

Expected Behavior

Should list any existing debug info collection tasks or return an empty list.

Likely Causes

1. Incorrect endpoint path
2. Handler expecting different response format
3. The list endpoint might not exist (only specific task endpoints)

Investigation Needed

• Verify if a list endpoint exists for debug info tasks
• Test with raw API: redisctl api enterprise get /v1/debuginfo
• Check Redis Enterprise API docs for correct debug info endpoints
• May need to use /v1/debuginfo/all or similar

Acceptance Criteria

• Command returns list of debug info tasks or empty list
• Doesn't hang or timeout
• Add integration test for this command

Part of #315

[joshrotenberg]

This issue refers to a non-existent command. The command debug-info list doesn't exist.

The available debug-info commands are:

• enterprise debug-info all - Collect all debug info
• enterprise debug-info node - Collect node debug info
• enterprise debug-info database - Collect database-specific debug info

All of these commands work correctly (though they may return empty results depending on cluster state):

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 debug-info all