Resolve handling of ESCAPE clause with LIKE queries on EclipseLink

[gregturn]

For some reason, EclipseLink doesn't handle the LIKE queries with SpEL expressions and the ESCAPE character. For Hibernate, this involved a change to the HQL grammer.

However for EclipseLink, this may be a different issue.

[gregturn]

Related: #2954

[gregturn]

Looks like this is HSQL's fault. When I run the same tests against H2, it runs just fine.

[gregturn]

This fix should be candidate for backporting to supported versions of Spring Data JPA.