feat:-test added to rcDOM for more coverage

[Biki-das]

few test added to reactDOMRoot container on few cases checking around:-

1. container being an element node
2. container being a document node
3. container being a documentFragment node

[react-sizebot]

Comparing: 0cdfef19b96cc6202d48e0812b5069c286d12b04...8d6837bf1c34ffd7786bc69fe3021f9fe79134b4

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	175.90 kB	175.90 kB	=	54.75 kB	54.75 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	177.97 kB	177.97 kB	=	55.39 kB	55.39 kB
facebook-www/ReactDOM-prod.classic.js	=	570.21 kB	570.21 kB	=	100.35 kB	100.35 kB
facebook-www/ReactDOM-prod.modern.js	=	554.06 kB	554.06 kB	=	97.43 kB	97.43 kB
test_utils/ReactAllWarnings.js	Deleted	67.41 kB	0.00 kB	Deleted	16.49 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	67.41 kB	0.00 kB	Deleted	16.49 kB	0.00 kB

Generated by :no_entry_sign: dangerJS against 8d6837bf1c34ffd7786bc69fe3021f9fe79134b4

[github-actions[bot]]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[github-actions[bot]]

Closing this pull request after a prolonged period of inactivity. If this issue is still present in the latest release, please ask for this pull request to be reopened. Thank you!