Limit tGATT_IF range

This commit restricts the range of tGATT_IF
values to 1-248, reserving 249-255 for special use cases.
This change ensures consistency and avoids potential conflicts.

Additionally, the commit addresses issues found while
checking all the tGATT_IF usages.

Bug: 348559823
Bug: 273561907
Test: atest BumbleBluetoothTests
Change-Id: I0b1eb3b1e8736661ea0b9024257c9e7a9c20ad35