De-duplicate the logic for counting attachments

[cubuspl42]

Summary:

De-duplicate the logic for counting attachments.

This is a minor improvement in the context of my multi-PR work on https://github.com/react-native-community/discussions-and-proposals/issues/695.

Changelog:

[INTERNAL] [CHANGE] - De-duplicate the logic for counting attachments

Test Plan:

[cubuspl42]

@rozele Any chance you could review this?

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	17,066,833	+1
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	20,450,443	+11
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: cfc0ba04a1fa147517e94d1f952e2a8fe62e6e9c Branch: main

[cubuspl42]

@rozele I took a look at the "build_npm_package" check and it seems unrelated to my changes 🙂

[cubuspl42]

@cipolleschi Thank you for reviewing and approving this PR! What is the next action point here? 🙂

[cipolleschi]

/rebase - this comment automatically rebase the PR on top of main

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cipolleschi]

I'm soooo sorry! I was sure we already merged this PR in main. 🤦 I'll proceed importing and have it landed.

[facebook-github-bot]

@cipolleschi merged this pull request in facebook/react-native@69977d05f005c93923a257aae9f5e06957fe8bc7.