[expo-dev-client] fix .npmignore (#13990)

[dev-client] Add instrumented tests on Android (#13639)

# Why

Closes ENG-1569.
Needs https://github.com/expo/expo/pull/13638 to work.

# How

Added instrumented tests to `expo-dev-client` pa

[dev-client] Add instrumented tests on Android (#13639)

# Why

Closes ENG-1569.
Needs https://github.com/expo/expo/pull/13638 to work.

# How

Added instrumented tests to `expo-dev-client` package. However, this code won't be released by npm. So it's only for internal purposes. Also, to test more scenarios, I've created a simple app that will be loaded by the dev-client. It's also excluded from being published.

# Test Plan

- run created test locally

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