feature cleanup: address lookup table program authority checks

[buffalojoec]

Problem

Feature FKAcEvNgSY79RpqsPNUV5gDyumopH4cEHqUxyfm8b8Ap (relax_authority_signer_check_for_lookup_table_creation) has been activated on all clusters. It can be cleaned up.

Summary of Changes

Clean up the feature in the builtin, tests, and CLI.

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[buffalojoec]

@topointon-jump does cleaning up a feature in a builtin like this affect you guys? re: Mergify note.

[jstarry]

Thanks for cleaning this up! I played around with cleaning up some more cli stuff and just committed that to your branch, hope you don't mind. Just figured it was faster than having you redo the same cleanup. Can you take a look and make sure it looks correct?

[buffalojoec]

Can you take a look and make sure it looks correct?

Yep, lgtm. Thanks for throwing that up!

[topointon-jump]

@topointon-jump does cleaning up a feature in a builtin like this affect you guys? re: Mergify note.

@buffalojoec it does, thanks for the heads up!

[joncinque]

Looks great!