[Linux/OSX] Add missing "--terminal" argument to run-android

[jamsch]

Commit 79e498b claims that "--terminal" has been added as an argument to the "run-android" script which it hasn't. Instead it adds a new environment variable "process.env.REACT_TERMINAL" which seems to be undocumented and nowhere else in the repository.

This commit now allows Linux and OSX users to specify their custom terminal :

react-native run-android --terminal=x-terminal-emulator

Additionally the metro bundler child process "detached" option has been set to false if no terminal has been specified on Linux which fixes an issue where the packager would be running in the background and would have to manually be closed by finding the process.

Fixes #18122

Test Plan:

None

Release Notes:

[CLI] [BUGFIX] [local-cli/runAndroid/runAndroid.js] - Add missing "--terminal" argument

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hramos is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

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[hramos]

Re-importing. This failed earlier, because the PR was updated after it was approved but before it could be imported.

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This pull request was closed by @jamsch in d846696.

Once this commit is added to a release, you will see the corresponding version tag below the description at d846696. If the commit has a single master tag, it is not yet part of a release.