[client] Remove vendored gesture handler (#21502)

# Why

Removes vendored gesture handler.
Another step to support Fabric by the dev-client.

> Note: To support fabric in the dev-client, we nee

[client] Remove vendored gesture handler (#21502)

# Why

Removes vendored gesture handler.
Another step to support Fabric by the dev-client.

> Note: To support fabric in the dev-client, we need to rewrite the safe area context, but that won't be difficult, because that module is pretty straightforward and we can use our API to support both renderers.

# How

- Removed vendored code.
- Mocked functions required by react-navigation.
- Disabled gesture in the stack navigator.

The swipe gesture won't longer close a screen, but I think it's something that we can sacrifice. Also, most of our screens are rendered inside the bottom tab navigator.

# Test Plan

- bare-expo on both platforms ✅
- ensures that the stack navigator works correctly ✅

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