Remove pending intent from framework provider APIs

Pending intents will be added to the Slice objects as
slice actions through the jetpack library. Earlier,
we needed this at the framework level as the framework was invoking
the pending intent. We have now changed the design to have the UI
app directly launch the pending intent.

Test: Built locally
Bug: 264717022

Change-Id: I2c62819bb4a60a55e9fbf7552ce2a7dc84dff3ee