Add breaking changes documentation for pipeline activity reporter API rename (PR #12137)

[Copilot]

• Review PR #12137 details and understand API changes
• Create breaking-changes article in docs/compatibility/13.0/ directory
• Update docs/fundamentals/custom-deployments.md to reflect new API names and usage patterns
• Update docs/extensibility/interaction-service.md to reflect new context types
• Add new breaking change to compatibility/toc.yml
• Create index.md for 13.0 version
• Build and validate documentation locally (markdown linting passed, YAML validation passed)
• Address code review feedback (parameter naming consistency)
• Fix cross reference warnings by replacing xref tags with inline code formatting

Original prompt

Please create a breaking-changes article that covers the API changes in @dotnet/aspire/pull/12137 - Also, please update the ./fundamentals/custom-deployments.md and ./extensibility/interaction-service.md articles accordingly.

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Internal previews

📄 File	🔗 Preview link
docs/compatibility/13.0/index.md	docs/compatibility/13.0/index
docs/compatibility/13.0/pipeline-activity-reporter-renamed.md	docs/compatibility/13.0/pipeline-activity-reporter-renamed
docs/compatibility/toc.yml	docs/compatibility/toc
docs/extensibility/interaction-service.md	docs/extensibility/interaction-service
docs/fundamentals/custom-deployments.md	docs/fundamentals/custom-deployments

[IEvangelist]

Hey @copilot please address these warnings:

./compatibility/13.0/pipeline-activity-reporter-renamed.md
Line 136: [Warning] Cross reference not found: 'Aspire.Hosting.Publishing.PublishingActivityReporter'.
Line 140: [Warning] Cross reference not found: 'Aspire.Hosting.Publishing.PublishingStep'.
Line 141: [Warning] Cross reference not found: 'Aspire.Hosting.Publishing.PublishingTask'.
./fundamentals/custom-deployments.md
Line 17: [Warning] Cross reference not found: 'Aspire.Hosting.Pipelines.IPipelineActivityReporter'.

Please just remove the xref for now and instead wrap the type in code, for example IPipelineActivityReporter.

[Copilot]

Hey @copilot please address these warnings:

./compatibility/13.0/pipeline-activity-reporter-renamed.md
...

Fixed in commit 7c8df56. Replaced the failing xref tags with inline code formatting for PublishingActivityReporter, PublishingStep, PublishingTask, and IPipelineActivityReporter.