Revert keeping selected element in sync with canvas state

[philippfromme]

Proposed Changes

Due to the numerous issues found (camunda/camunda-modeler#5386) this reverts the changes that lead to these issues. We'll have to look into this again and maybe think about better ways to test the properties panel to make sure we catch these issues in the future.

Checklist

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• Brief textual description of the changes present
• Visual demo attached
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• Related issue linked via Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}

[Copilot]

Pull Request Overview

This PR refactors the properties panel rendering logic by moving event handling and state management from the BpmnPropertiesPanelRenderer class into the BpmnPropertiesPanel React component. This enables better React lifecycle management and simplifies the renderer's responsibilities.

• Event listeners moved from renderer to React component using useEffect hooks
• State management now handled via React hooks (useState, useMemo, useCallback)
• Renderer simplified to only handle root.added events and delegate to the React component

Reviewed Changes

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

Show a summary per file

File	Description
src/render/BpmnPropertiesPanelRenderer.js	Removed state management and event handling logic; simplified to only handle root.added event
src/render/BpmnPropertiesPanel.js	Added React hooks for event handling, state management, and layout changes; moved logic from renderer
test/spec/BpmnPropertiesPanel.spec.js	Updated tests to reflect new component-based event handling; added tests for new event behaviors
test/spec/BpmnPropertiesPanelRenderer.spec.js	Removed redundant rendering tests; simplified to test root.added behavior
src/provider/bpmn/BpmnPropertiesProvider.js	Reordered constructor statements to register provider before storing injector
src/provider/zeebe/ZeebePropertiesProvider.js	Reordered constructor statements to register provider before storing injector
src/provider/camunda-platform/CamundaPlatformPropertiesProvider.js	Reordered constructor statements to register provider before storing injector

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[barmac]

@philippfromme any root cause analysis for the problem?

[philippfromme]

@philippfromme any root cause analysis for the problem?

Unfortunately I haven't found the exact root cause yet. But I suspect that part of the problem lies in the core properties panel (cf. https://github.com/bpmn-io/properties-panel/blob/51649e1450acb06a566435d14f75339bdaf5af59/src/PropertiesPanel.js#L142) and that it was more or less accidentally working. I need to look into this again.