Rename TX_RECONSIDERABLE to TX_PACKAGE_RECONSIDERABLE

Summary:
This better convey the meaning of this validation result, and makes it easier to add other possible reconsideration reasons (e.g. pre-consensus). Same goes for the related bloom filter.

Rename only, there is no change in behavior.

Test Plan:

ninja all check-all

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D16573