Update appendonly_compaction.c, add helpfull debug via Debug_appendon…

[reshke]

…ly_print_compaction

Recently have been debugging some unrelated issue, and i happened to notice that Debug_appendonly_print_compaction printing gone in CBDB (it was very helpfull in GPDB6) So, I propose to bring it back.

fix #ISSUE_Number

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[reshke]

Similar logging can be found in functions AOCSSegmentFileTruncateToEOF/AOCSCompact in CBDB https://github.com/cloudberrydb/cloudberrydb/blob/main/src/backend/access/aocs/aocs_compaction.c#L388