…stmored)

This PR was squashed before being merged into the 4.x branch.

Discussion
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Allow searching by associated fields with the same name

This little change handles the case when we have custom search fields defined in CRUD configuration, but each pointing to a field with the same name. Example taken from my daily project:

Entity `Department` has (among others) 2 associations - `City` and `Company`. In CRUD I'd like to easily search by department name and both company name and city name, so:
`->setSearchFields(['id', 'name', 'city.name', 'company.name'])`

The way it's done in `EntityRepository` makes it only search by `company.name`, as field name is taken as the key for search fields configuration. I moved the field name to a property and return a list from `getSearchablePropertiesConfig()` to mitigate the issue.

This time around I was able to work with tests - I have extended `BlogPost` fixture to include optional publisher association and then search by both `author` and `publisher`. It fails without this little change and works as expected after.

Commits
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903abf1 Allow searching by associated fields with the same name