Remove unused XLogAODropSegmentFile function
The XLogAODropSegmentFile function was used for implementing invalid page logging for AO. In the past year, there have been significant changes after removing MMXLOG_REMOVE_FILE XLOG record type that make this function no longer needed (currently only being used by a unit test). The most relevant change is that deletion of AO segment files only happen during DROP TABLE (vacuum was changed to truncate the segment file) which makes things easier for AO to reuse the existing invalid page logging implementation. References: https://github.com/greenplum-db/gpdb/commit/175c25e8fb0494933087ff19ef29d7377e021702 https://github.com/greenplum-db/gpdb/commit/8165e1b1627b9b2f8b40c3c55eab9de3d137b70a https://github.com/greenplum-db/gpdb/commit/8838ac983c66af74d0a1422337cf92f08fbe5f2c
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