Prior to this commit, executing an SQL script with JdbcTestUtils would
fail if a statement in the script contained a line comment within the
statement.
This commit ensures that standard SQL comments (i.e., any text beginning
with two hyphens and extending to the end of the line) are properly
omitted from the statement before executing it.
In addition, multiple adjacent whitespace characters within a statement
but outside a literal are now collapsed into a single space.
Issue: SPR-9982
d0f687f028