Remove TextInput blurOnSubmit

[zoontek]

Summary:

Removes the blurOnSubmit TextInput prop, deprecated since 0.77 in favor of submitBehavior. Cleans it from the JS API, types, native component spec, and rn-tester examples. Default behavior is unchanged: single-line inputs blur and submit, multiline inputs insert a newline.

See #57384

Changelog:

[GENERAL] [REMOVED] - Remove deprecated TextInput blurOnSubmit prop (use submitBehavior instead)

Test Plan:

• yarn flow check passes
• yarn build-types regenerates the API snapshot without blurOnSubmit
• rn-tester "Submit behavior" example still covers all submitBehavior values

[github-actions]

Warning

JavaScript API change detected

This PR commits an update to ReactNativeApi.d.ts, indicating a change to React Native's public JavaScript API.

• Please include a clear changelog message.
• This change will be subject to additional review.

This change was flagged as: POTENTIALLY_BREAKING