Update ECOSYSTEM.md to reflect updated partnerships

[stmoy]

Summary

To help reflect how we've collectively been thinking about partnership and engagement on React Native, this change moves Facebook into the Partners list alongside other partners like Expo, Microsoft, and others. This change helps establish that the React Native teams across Facebook & Microsoft are one big happy family :)

Changelog

[General] [Changed] - Updated ECOSYSTEM.md to reflect partnerships between Facebook, Microsoft, and others

Test Plan

N/A - document change

[facebook-github-bot]

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[stmoy]

CC: @TheSavior

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	6,765,394	-3,390
android	hermes	armeabi-v7a	6,433,038	-2,598
android	hermes	x86	7,153,228	-3,698
android	hermes	x86_64	7,043,131	-3,517
android	jsc	arm64-v8a	8,936,756	-2,584
android	jsc	armeabi-v7a	8,596,805	-1,776
android	jsc	x86	8,767,717	-2,886
android	jsc	x86_64	9,343,248	-2,699

Base commit: 0d3e535

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 0d3e535

[facebook-github-bot]

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

[react-native-bot]

This pull request was successfully merged by @stmoy in d48f7ba.

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