feat: track copy action usage

[barinali]

Proposed Changes

This pull request aims to introduce a tracking event for the copy action.

Event Name	Action
variableNameCopy	User copies a variable name via the copy button
variablePathCopy	User copies a variable path via context menu
variableValueCopy	User copies a variable value via context menu

Checklist

Ensure you provide everything we need to review your contribution:

• Contribution meets our definition of done
• Pull request establishes context
  • Link to related issue(s), i.e. Closes {LINK_TO_ISSUE} or Related to {LINK_TO_ISSUE}
  • Brief textual description of the changes
  • Screenshots or short videos showing UI/UX changes
  • Steps to try out, i.e. using the @bpmn-io/sr tool

[Copilot]

Pull request overview

This PR adds analytics tracking for user copy actions in the variable outline UI, leveraging the existing useTracking hook (bpmn-js-tracking integration).

Changes:

• Track variable name copy via the CopyButton (variableNameCopy).
• Track variable path/value copy via the JSON context menu (variablePathCopy, variableValueCopy).
• Add/adjust tests to validate new tracking behavior and update some shared test helpers.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lib/hooks/useContextMenuBehavior.js	Emits tracking events for context-menu “copy path/value” actions.
lib/components/CopyButton.jsx	Emits tracking event for “copy variable name” button clicks.
lib/hooks/test/useContextMenuBehavior.spec.jsx	New unit tests for context-menu copy tracking.
lib/components/test/CopyButton.spec.jsx	New unit test for copy button tracking.
lib/components/VariableRow/test/ValueDisplay.spec.jsx	Wraps ValueDisplay with InjectorContext in tests (to support tracking-enabled components).
lib/hooks/test/useVariables.spec.jsx	Test helper simplification (drops unused options parameter).
lib/context/test/FilterContext.spec.jsx	Test helper simplification (drops unused options parameter).
lib/components/Search/test/Search.spec.jsx	Test helper simplification (drops unused options parameter).
lib/components/ScopeList/test/ScopeList.spec.jsx	Removes unused injected args + test helper simplification.
CHANGELOG.md	Adds entry for the new tracking feature.

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