Support RBM_ZERO_AND_CLEANUP_LOCK in ExtendBufferedRelTo(), add tests

For some reason I had not implemented RBM_ZERO_AND_CLEANUP_LOCK support in
ExtendBufferedRelTo(), likely thinking it not being reachable. But it is
reachable, e.g. when replaying a WAL record for a page in a relation that
subsequently is truncated (likely only reachable when doing crash recovery or
PITR, not during ongoing streaming replication).

As now all of the RBM_* modes are supported, remove assertions checking mode.

As we had no test coverage for this scenario, add a new TAP test. There's
plenty more that ought to be tested in this area...

Reported-by: Tom Lane <[email protected]>
Reported-by: Alexander Lakhin <[email protected]>
Reviewed-by: Alexander Lakhin <[email protected]>
Discussion: https://postgr.es/m/392271.1681238924%40sss.pgh.pa.us
Discussion: https://postgr.es/m/[email protected]

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