Deduplicate Worker Deployments within a "single" Page

[Shivs11]

Summary

• deduplicate Worker Deployment summaries by deployment name within each fetched Visibility page
• retain the record with the newest workflow start time while preserving the page's first-occurrence ordering
• keep Visibility pagination state and next-page tokens unchanged
• cover Continue-As-New, missing-memo, delete-and-recreate, unrelated-deployment, and page-boundary behavior

Root cause

Worker Deployment creation can immediately Continue-As-New, and delete-and-recreate starts another run with the same deployment identity. Because Visibility updates are eventually consistent, the successor start can be visible before the predecessor close update. ListWorkerDeployments previously converted every returned execution into a summary, so overlapping running records in the same Visibility page appeared as duplicate deployments.

This change post-processes only the fetched page. It does not add cross-page state or alter Worker Deployment workflow behavior.

Testing

• added unit tests that mock visibility to return duplicate data which verifies if the added logic works or not

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Note

Low Risk
Read-path-only change to list summarization with bounded per-page logic; deployment workflow behavior and pagination contracts are unchanged.

Overview
ListWorkerDeployments no longer emits one summary per Visibility row when the same deployment appears multiple times on a page (e.g. Continue-As-New or delete/recreate while Visibility is eventually consistent).

After each Visibility fetch, results are post-processed by collapseDuplicateDeploymentSummaries: rows are keyed by deployment name, the run with the latest execution start time wins, and the output keeps the first-seen slot ordering for that page. Next-page tokens are unchanged; dedup does not span pages.

Unit tests mock Visibility to cover newest-run wins (including memo-not-yet-written), mixed deployments on one page, and duplicates split across pages.

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