Fix: delete broken/unused JsonStreamWriter tutorial

[PhongChuong]

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Fixes #2338 ☕️

If you write sample code, please follow the samples format.

BEGIN_COMMIT_OVERRIDE
chore: Delete broken/unused JsonStreamWriter tutorial
END_COMMIT_OVERRIDE

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/