pgsql: Reorder log_autovacuum_min_duration log output.

Reorder log_autovacuum_min_duration log output.

This order seems more natural.  It starts with details that are
particular to heap and index data structures, and ends with system-level
costs incurred during the autovacuum worker's VACUUM/ANALYZE operation.

Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-WzkzxK6ahA9xxsOftRtBX_R0swuHZsvo4QUbak1Bz7hb7Q@mail.gmail.com
Backpatch: 14-, which enhanced the log output in various ways.

Branch
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REL_14_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/fd134f374ef7a8cc0b2d878a92dfe2c7088e084b

Modified Files
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src/backend/access/heap/vacuumlazy.c | 33 ++++++++++++++++-----------------
src/backend/commands/analyze.c       | 12 ++++++------
2 files changed, 22 insertions(+), 23 deletions(-)