Move `'bp_register_post_types'` and `'bp_register_taxonomies'` hooks before`'bp_core_set_uri_globals'`

[r-a-y]

Split from #7138, we should preferably move our 'bp_register_post_types' and 'bp_register_taxonomies' hooks before bp_core_set_uri_globals() is run.

Currently, bp_core_set_uri_globals() runs on 'bp_init' at priority 2 and the two other hooks run at priority 3.

Attached patch does two things:

• Sets the priority of 'bp_register_post_types' and 'bp_register_taxonomies' to 2 and called just before the 'bp_core_set_uri_globals' hook.
• Replaces add_action( 'bp_loaded', 'bp_register_member_types', 8 ); with add_action( 'bp_register_taxonomies', 'bp_register_member_types' ); to be more inline with our existing 'bp_register_taxonomies' hook.

[DJPaul]

LGTM

[r-a-y]

In 10981:

Core: Move 'bp_register_post_types' and 'bp_register_taxonomies' hooks before'bp_core_set_uri_globals'.

This commit does two things:

• Sets the priority of the 'bp_register_post_types' and 'bp_register_taxonomies' to 2 and called just before the 'bp_core_set_uri_globals' hook.
• Registers our member and group types on the more, appropriate 'bp_register_taxonomies' hook.

Fixes #7151.