Add rake task to display Semantic Code Search status
## Problem
Operators and developers working with Semantic Code Search need a quick way to check the status of the system, similar to the existing `gitlab:elastic:info` and `gitlab:zoekt:info` rake tasks.
Currently, there's no standardized command to view:
- Whether indexing is enabled and active
- Vector store connection status
- Repository indexing statistics
- Embedding queue sizes
## Proposal
Add a `gitlab:semantic_search:code:info` rake task that displays:
1. **Indexing Status**
- Indexing enabled (config setting)
- Indexing active (checks embedding models are configured)
2. **Connection Information**
- Connection name
- Adapter type (Elasticsearch/OpenSearch/PostgreSQL)
- Active status
3. **Repository Statistics**
- Total repositories
- Ready, pending, indexing (code/embedding), and failed counts
4. **Embedding Queue Metrics**
- Code queue size, shard count, and limit
- Backfill queue size, shard count, and limit
- Retry queue size
- Dead queue size
## Implementation
Follow the same pattern as existing search rake tasks:
- `ee/lib/tasks/gitlab/semantic_search.rake` - Rake task definition
- `ee/lib/search/rake_task/semantic_search.rb` - Module with logger setup
- `ee/app/services/search/semantic_search/rake_task_executor_service.rb` - Service implementing the info task
Use Rainbow for colored output (green for yes, red for errors, yellow for section headers) to match the Elasticsearch and Zoekt tasks.
## Example Output
```
Semantic Code Search
Indexing enabled: yes
Indexing active: no
Connection:
Name: postgres
Adapter: ActiveContext::Databases::Postgresql::Adapter
Active: yes
Repositories
Total: 1
Ready: 1
Pending: 0
Code indexing in progress: 0
Embedding indexing in progress: 0
Failed: 0
Embedding Queues
Code queue: 5
Shard count: 1
Shard limit: 1000
Backfill queue: 0
Shard count: 1
Shard limit: 1000
Retry queue: 0
Dead queue: 10
```
issue