Howie/samples 4

[howieleung]

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

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All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR adds new azure-ai-projects hosted agent samples covering routines and skills/toolboxes, with accompanying sample test configuration and changelog updates.

Changes:

• Adds samples for routine CRUD and timer-triggered routine runs.
• Adds a sample for invoking a skill packaged inside a toolbox through an MCP tool.
• Updates hosted agent sample test skip list and changelog entries.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
sdk/ai/azure-ai-projects/tests/samples/test_samples.py	Skips routine samples with known service serialization issues.
sdk/ai/azure-ai-projects/samples/hosted_agents/sample_skill_in_toolbox.py	Adds a hosted agent sample for skill invocation through a toolbox MCP endpoint.
sdk/ai/azure-ai-projects/samples/hosted_agents/sample_routines_with_timer_trigger.py	Adds a timer-triggered routine sample that polls routine runs.
sdk/ai/azure-ai-projects/samples/hosted_agents/sample_routines_crud.py	Adds a routine CRUD sample.
sdk/ai/azure-ai-projects/CHANGELOG.md	Documents the newly added routine samples.

[dargilco]

Looks good. Per our discussion, please hold off from completing this PR until we do the release. Thanks!