[PM] Don't preserve the label in the stage data (1/N)

If we preserve the label in the stage data, if the system language is
changed, then the label may not be updated. Because the data is not
updated with the configuration changes.

Flag: android.content.pm.use_pia_v2
Test: manual. Change the system language
Bug: 441658036
Change-Id: Ie6023f3992673955759894c57636c4d71eb802b3