[dev-client][android] Add unit tests (#12617)

# Why

Needs https://github.com/expo/expo/pull/12620 to work.

Adds basic units test to dev-menu and dev-launcher.

# How

- set up unit test us

[dev-client][android] Add unit tests (#12617)

# Why

Needs https://github.com/expo/expo/pull/12620 to work.

Adds basic units test to dev-menu and dev-launcher.

# How

- set up unit test using `Robolectric`
- implemented basic unit test for dev-menu and dev-launcher

# Test Plan

- runs unit tests ✅

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