[Android] memory leak in Android

[feiyin0719]

Description

When we Integration RN as App SubActivity, if we close the Activity, it will cause memory leak

Explain Defect

since 0.65, when call dispatchViewUpdates, we add judge mNumRootViews>0

When we call removeRootView, it will decrease the mNumRootViews before dispatchViewUpdates

So when we remove the last rootview, it will skip call dispatchViewUpdates and do not remove it, it will cause memory leak

Version

0.65 - ~

Output of npx react-native info

N/A

Steps to reproduce

1. Integrate RN as part Activity of APP(do not use RN as MainActivity)
2. open RN Activity
3. close RN Activity
   it will cause memory leak

Snack, code example, screenshot, or link to a repository

code example
https://github.com/feiyin0719/RNMemoryLeakAndroid

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