[0.80] Make accessors inside HeadlessJsTaskService open again

[naquilini]

Target Branch

0.80

Link to commit or PR to be picked

react/react-native#52660

Description

The documentation in HeadlessJsTaskService for getReactHost and getReactNativeHost methods mention that users should override them to provide their own implementation.
However those vals are not open so users cannot really override them.

[react-native-bot]

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[chrfalch]

@react-native-bot merge 7ef57163cb016317e43e563da7ea181989f6abca 0.80-stable

[react-native-bot]

❌ I failed to process your request with this error:

Failed to cherry-pick 7ef57163cb016317e43e563da7ea181989f6abca on branch 0.80-stable with: 1 with 'Command failed: cd react-native; git cherry-pick 7ef57163cb016317e43e563da7ea181989f6abca'

console output:

On branch 0.80-stable
You are currently cherry-picking commit 7ef57163cb.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   packages/react-native/ReactAndroid/api/ReactAndroid.api

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   packages/react-native/ReactAndroid/src/main/java/com/facebook/react/HeadlessJsTaskService.kt

[chrfalch]

Manually picked