fix: harden managed workspace lifecycle

[radu-mocanu]

Summary

• prevent streamed workspace access from leaking to consumers or child tasks
• make workspace cleanup safe when disposal is concurrent or cancelled
• preserve resumable workspace behavior across async iterator boundaries

Why

streaming and cancellation can otherwise leave a workspace accessible after execution or race while deleting it.

[Copilot]

Pull request overview

This PR hardens the managed workspace lifecycle in the UiPath Runtime Python SDK to prevent workspace access from leaking across streaming boundaries and to make workspace cleanup safer under concurrency and cancellation.

Changes:

• Revokes managed workspace availability outside execution scopes (including between streamed events and for child tasks created during execution).
• Refactors HydrationRuntime.stream() to scope workspace access to each anext() call and to explicitly close the delegate stream.
• Makes Workspace.dispose() serialized and idempotent for concurrent/cancelled callers; adds regression tests and bumps version to 0.12.7.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
uv.lock	Bumps local package version to 0.12.7.
pyproject.toml	Bumps project version to 0.12.7.
src/uipath/runtime/workspace/workspace.py	Adds serialized, idempotent async disposal with locking/task shielding.
src/uipath/runtime/workspace/hydration.py	Re-scopes streaming execution to avoid leaking workspace context to consumers/child tasks.
src/uipath/runtime/workspace/context.py	Introduces revocable workspace execution state via ContextVar + shared mutable execution object.
tests/workspace/test_workspace_hydration.py	Adds tests for streaming access revocation, child task isolation, and concurrent/cancelled dispose behavior.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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