fix: use hash to compare user metadata value (#10749)

# Which Problems Are Solved

Depending on the metadata values (already existing), the newly created
index (#10415) cannot be created or error in the future.

# How the Problems Are Solved

- Create the index using `sha256` and change the query to use sha256 as
well when comparing bytes values such as user_metadata.
- Added a setup step to cleanup potentially created index on
`projections.user_metadata5`

# Additional Changes

None

# Additional Context

- relates to #10415
- requires backport to v4.x

(cherry picked from commit 57e8033b6e)

internal/query/search_query.go

@@ -648,13 +648,12 @@ func (q *BytesQuery) toQuery(query sq.SelectBuilder) sq.SelectBuilder {
 func (q *BytesQuery) comp() sq.Sqlizer {
 	switch q.Compare {
 	case BytesEquals:
-		return sq.Eq{q.Column.identifier(): q.Value}
+		return sq.Expr("sha256("+q.Column.identifier()+") = sha256(?)", q.Value)
 	case BytesNotEquals:
-		return sq.NotEq{q.Column.identifier(): q.Value}
+		return sq.Expr("sha256("+q.Column.identifier()+") <> sha256(?)", q.Value)
 	case bytesCompareMax:
 		return nil
 	}
-
 	return nil
 }