fix: unexpected element clear

[Aarebecca]

• 修复 element.clear 清理不彻底的问题

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• Fixed the issue that element.clear was not cleaned thoroughly

[petercat-assistant]

Walkthrough: This pull request addresses an issue where the element.clear method was not thoroughly cleaning elements. The changes ensure that the container is properly destroyed and re-initialized, thus resolving the incomplete cleanup problem.

Changes:

Files	Summary
packages/g6-extension-3d/package.json, packages/g6-extension-react/package.json, packages/g6-ssr/package.json, packages/g6/package.json	Updated package version numbers.
packages/g6/tests/bugs/graph-draw-after-clear.spec.ts	Added a snapshot test to verify the graph is blank after clearing.
packages/g6/tests/snapshots/bugs/graph-draw-after-clear/blank.svg	Added new snapshot for blank state verification.
packages/g6/tests/snapshots/bugs/graph-draw-after-clear/default.svg	Removed old snapshot data.
packages/g6/src/runtime/element.ts	Modified the clear method to destroy and reinitialize the container. Added initContainer method for container management.
packages/g6/src/version.ts	Updated version number from 5.0.41 to 5.0.42.

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