Fix max call stack error when closing large outline

[faraon-bot]

Fixes #235889

Implement an iterative approach to manage the outline in the OutlineModel class.

• Add a stack to handle the children of the outline elements iteratively in the _makeOutlineElement method.
• Replace the recursive call with a loop that processes the stack in the _makeOutlineElement method.
• Add a stack to handle the children of the document symbols iteratively in the _flattenDocumentSymbols method.
• Replace the recursive call with a loop that processes the stack in the _flattenDocumentSymbols method.

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[jrieken]

The changes in the PR seems unrelated to the linked issue and the error that's reported there.