Refreshin App Market Intent on Plus Icon Click

Currently the App Market intent is loaded statically into
Launcher, once during start. Sometimes, this causes the app
market activity start to be blocked, resulting in no action
from button tap.

To fix this, we hot-reload the intent when the plus button is
clicked.

Bug: 323189130
Test: Launcher3 test.
Flag: ACONFIG com.android.launcher3.Flags.enable_private_space TRUNKFOOD
Change-Id: I563d29838a43644ba8e0830b39d4f4ef8c60aeb6