[Android parity] showPopupMenu shouldn't crash when the tag isn't found

[rigdern]

Currently, UIManager's showPopupMenu throws an exception when it can't find the tag. The Android implementation was changed such that the error is reported back to JavaScript rather than throwing a native exception.

Here's the Android PR that needs to be ported to RNW: facebook/react-native#17550

[rozele]

We don't have any support for showPopupMenu, but this is being added in #1876. @rigdern can you advise if you need this feature?

We are not investing in new features or lower priority bug fixes on vCurrent. The bulk of investment is now in vNext as we prepare to make that the default choice. If this issue is still relevant on the vNext implementation please open a vNext issue. If this issue is of significant severity for a vCurrent app and vNext is not an option, re-open with justification.