[CDAP-21242] Add optimized Pipeline Summary API endpoint

[bhardwaj-priyanshu]

This PR introduces a new endpoint GET /v3/namespaces/{namespace}/apps/summary (Pipeline Summary API) to retrieve a summary of applications in a namespace. This endpoint is specifically optimized to return basic metadata, total run counts, and the latest run record while avoiding the heavy performance cost of full deserialization of application specifications.

Key Changes

• API Endpoint: Added /apps/summary in ProgramLifecycleHttpHandler with support for filtering by artifact name, version, and application name, as well as pagination.
• Performance Optimization: Implemented a streaming JSON parser in AppMetadataStore.AppScanEntry.getAppSummary() to extract only the necessary fields (artifact ID, description, and primary program) from the raw application metadata stored in the database.
• Data Aggregation: Added logic in ProgramLifecycleService to batch-fetch total run counts and the latest run record for all visible programs in the page, avoiding N+1 queries.

Tesing

• Added UTs
• Tested different queries by deploying the code

Next Steps

• Add next run time and tags in the summary API response

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
86.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud