Add python-environment's project support for pytest execution

[eleanorjboyd]

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[Copilot]

Pull request overview

This PR adds project-aware pytest execution support to the test controller flow by wiring Python Environments “projects” into execution/debugging, and introducing shared helpers + unit tests to validate the new behavior in multi-project workspaces.

Changes:

• Add project-based test execution orchestration (executeTestsForProjects, grouping test items by owning project, per-project execution).
• Pass project context into pytest execution and debugging (env var PROJECT_ROOT_PATH, LaunchOptions.project, project-derived Python path/session naming).
• Add centralized test mocks and new/updated unit tests covering project execution and debug-session lifecycle handling.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/client/testing/testController/common/projectTestExecution.ts	New project-based execution utilities (grouping, project lookup, coverage callback setup).
src/client/testing/testController/controller.ts	Routes pytest runs through project-based execution when projects are registered.
src/client/testing/testController/pytest/pytestExecutionAdapter.ts	Sets project execution environment (PROJECT_ROOT_PATH) and passes project into debug launch options; uses project environment when available.
src/client/testing/testController/unittest/testExecutionAdapter.ts	Updates execution adapter signature and adds logging around new parameters.
src/client/testing/common/debugLauncher.ts	Supports concurrent debug sessions via a per-launch marker; uses project name/python path when available.
src/client/testing/common/types.ts	Extends LaunchOptions to include optional project metadata.
src/test/testing/testController/testMocks.ts	Adds reusable mocks for project adapters, dependencies, and test items.
src/test/testing/testController/pytest/pytestExecutionAdapter.unit.test.ts	Adds unit tests validating project env var + debug launch options behavior for pytest.
src/test/testing/testController/common/projectTestExecution.unit.test.ts	Adds comprehensive unit tests for grouping, project resolution, execution orchestration, and coverage callback behavior.
src/test/testing/common/debugLauncher.unit.test.ts	Updates and adds tests for multi-session debug lifecycle tracking and project-specific config naming.