chore(inspect): improve SSE generator

[maxxgx]

📝 Description

Yield ServerSentEvent instead of raw string.
To be merged after #3053

✨ Changes

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• 🚀 New feature (non-breaking change which adds functionality)
• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🔄 Refactor (non-breaking change which refactors the code base)
• ⚡ Performance improvements
• 🎨 Style changes (code style/formatting)
• 🧪 Tests (adding/modifying tests)
• 📚 Documentation update
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• 🔧 Chore (general maintenance)
• 🔒 Security update
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)

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[Copilot]

Pull Request Overview

This PR refactors the job log streaming implementation to use Server-Sent Events (SSE) with proper types from the sse_starlette library. Instead of yielding raw strings, the code now yields ServerSentEvent objects and uses EventSourceResponse for the FastAPI endpoint.

Key Changes

• Updated JobService.stream_logs() to yield ServerSentEvent objects with proper type hints
• Replaced StreamingResponse with EventSourceResponse in the job logs endpoint
• Updated tests to reflect the new SSE-based streaming behavior

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
application/backend/src/services/job_service.py	Added SSE types, return type annotation, and modified generator to yield ServerSentEvent objects with stripped newlines
application/backend/src/api/endpoints/job_endpoints.py	Changed response type from StreamingResponse to EventSourceResponse and removed explicit media type
application/backend/tests/unit/services/test_job_service.py	Updated test to extract data from ServerSentEvent objects and removed newlines from mock log data
application/backend/tests/unit/endpoints/test_jobs.py	Updated mock generator to yield ServerSentEvent objects and adjusted assertion for SSE format overhead

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