Fix inconsistent key names in PATCH pipeline endpoint

[itallix]

Summary

• Rename model_revision_id to model_id and allow both aliases when validating model
• Fix legacy references

Checklist

• The PR title and description are clear and descriptive
• I have manually tested the changes
• All changes are covered by automated tests
• All related issues are linked to this PR (if applicable)
• Documentation has been updated (if applicable)

[Copilot]

Pull request overview

This PR renames the model_revision_id field to model_id in the Pipeline model to improve API consistency, while maintaining backward compatibility by accepting both field names during validation. The change also includes adding support for detecting model changes in running pipelines through a new event type.

• Renamed model_revision_id to model_id with backward-compatible validation using AliasChoices
• Added MODEL_CHANGED event type and corresponding event handling logic
• Updated all references throughout the codebase to use the new model_id field name

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
application/docs/models.md	Fixed grammatical error ("an parent-child" → "a parent-child")
application/backend/app/models/pipeline.py	Renamed field from model_revision_id to model_id with alias support for backward compatibility
application/backend/app/services/pipeline_service.py	Updated to use model_id and added MODEL_CHANGED event emission logic
application/backend/app/services/pipeline_metrics_service.py	Updated references from model_revision_id to model_id
application/backend/app/services/event/event_bus.py	Added MODEL_CHANGED event type and notification logic
application/backend/tests/unit/services/event/test_event_bus.py	Added test coverage for MODEL_CHANGED event
application/backend/tests/integration/services/test_pipeline_service.py	Updated test assertions and added new test for model switching with both field name aliases
application/backend/tests/integration/services/test_dataset_service.py	Updated test references from model_revision_id to model_id
application/backend/tests/conftest.py	Updated fixture to use model_id instead of model_revision_id

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[github-actions]

📊 Test coverage report

Metric	Coverage
Lines	40.2%
Functions	34.9%
Branches	84.8%
Statements	40.2%

[github-actions]

Docker Image Sizes

CPU

Image	Size
geti-tune-cpu:pr-5089	2.85G
geti-tune-cpu:sha-0883aea	2.85G

GPU

Image	Size
geti-tune-gpu:pr-5089	10.62G
geti-tune-gpu:sha-0883aea	10.62G

XPU

Image	Size
geti-tune-xpu:pr-5089	8.69G
geti-tune-xpu:sha-0883aea	8.69G

[A-Artemis]

Pipeline is already imported in this file, why not use it again?

[itallix]

Both are valid. But type(pipeline).model_validate(...) validates with the concrete runtime model returned by get_pipeline_by_id(), which makes this code more resilient to refactors (e.g., subclasses) than hard-coding Pipeline.model_validate(...).