Merge branch '6.x' into 8.x

Add more messages for detecting lost connection (happens during manag…

…ed PostgreSQL upgrade on DigitalOcean) (#36911)

 keep the counter (#36892)

 keep the counter (#36892)

Closes 36875 (#36881)

#36536 issue fix (#36801)

The use of whereHasMorph in a whereHas callback generates a wrong sql statements. Correction of this incorrectly constructed statement has been applied.

#36536 issue fix (#36801)

The use of whereHasMorph in a whereHas callback generates a wrong sql statements. Correction of this incorrectly constructed statement has been applied.

Use qualified column names in pivot query (#36720)

Co-authored-by: Menzo Wijmenga <[email protected]>

Use qualified column names in pivot query (#36720)

Co-authored-by: Menzo Wijmenga <[email protected]>

minor