Disable dump pax tables in pg_dump

[jiaqizho]

fix #ISSUE_Number

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Change logs

Pax is not working properly in pg_dump/pg_restore.

There are several problems:

1. The pax relative table in namespace pg_ext_aux won't be dump.
2. The table access method pax have not been setting in pg_dump.

Current change ignore pax table in pg_dump.

Why are the changes needed?

nope

Does this PR introduce any user-facing change?

nope

How was this patch tested?

none

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