add new tools to list and download pipeline artifacts

[YevheniiKholodkov]

The PR adds new pipeline tools:

• list_pipeline_artifacts - Lists artifacts for a given build.
• download_pipeline_artifact - Downloads a pipeline artifact and optionally saves the archive to a provided destinationPath

Notes:

• This PR does not add the third (optional) tool read_pipeline_artifact_file.
  While we have an endpoint to download a file from a container, there is no straightforward way to download a single file from a PipelineArtifact. Supporting only containers would likely be confusing.
• I intentionally did not add ZIP extraction to download_pipeline_artifact to keep the tools simple.

GitHub issue number

Fixes issue #737

Associated Risks

No direct risks, but might increase API usage

✅ PR Checklist

• [✅] I have read the contribution guidelines
• [✅] I have read the code of conduct guidelines
• [✅] Title of the pull request is clear and informative.
• [✅] 👌 Code hygiene
• [N/A] 🔭 Telemetry added, updated, or N/A
• [✅] 📄 Documentation added, updated, or N/A
• [✅] 🛡️ Automated tests added, or N/A

🧪 How did you test it?

• Tools were tested on production data using prompts like:
  can you list artifacts from a build with id <build id>?
can you download the artifact <artifact name>?
• unit tests

[polatengin]

I like it 👍

[polatengin]

some tests are failing, fix them please 👍

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@c978428). Learn more about missing BASE report.

Additional details and impacted files

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  Misses          ?       19           
  Partials        ?       69           

Flag	Coverage Δ
unittests	94.22% <100.00%> (?)

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