[react-dom] Include submitter in submit events

[eps1lon]

Summary

SubmitEvent.submitter is widely supported so we should expose it. We assume submitter is supported since #29028.

This doesn't include a polyfill for older browsers.

Closes #33033

How did you test this change?

• added tests which fail without adding SubmitEventInterface

[react-sizebot]

Comparing: cdbd55f...e87d02a

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.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	+0.04%	608.67 kB	608.90 kB	+0.03%	107.63 kB	107.66 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	=	1.88 kB	1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	+0.04%	674.60 kB	674.84 kB	+0.04%	118.57 kB	118.62 kB
facebook-www/ReactDOM-prod.classic.js	+0.03%	694.04 kB	694.28 kB	+0.02%	122.01 kB	122.04 kB
facebook-www/ReactDOM-prod.modern.js	+0.03%	684.43 kB	684.67 kB	+0.02%	120.40 kB	120.43 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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