Remove delightful page indicator

Due to design changes, we are no longer going to use the  changes guarded under the flag SHOW_DELIIGHTFUL_PAGINATION, so we remove the flag and the code that was guarded by that flag

Bug: 261904707
Test: verify flag SHOW_DELIGHTFUL_PAGINATION no longer exists and that the regular pagination works without issues after removing all this code
Change-Id: I244b88b98df0357aa99a325a11988e8248a03206