New feature:
- ADBDEV-6339 Implement files tracking for arenadata_toolkit #1079

Fixes:
- ADBDEV-6314: Fix unexpected output for empty grouping set #1117
- ADBDEV-6835: Fix modified GUCs when starting a new slice #1148
- ADBDEV-6909-6X: Remove greenplum-specific documentation #1165
- ADBDEV-6960: Fix the ubuntu version in abi tests #1179
- ADBDEV-6950: Don't recycle WAL when receiving archival report in
  archive_mode always #1183