Remove use of LOWER from city & street searches

[eileenmcnaughton]

Overview

Improve performance and reliability of searches involving street address & city (under some circumstances) by relying on mysql to handle case.

Before

We actively convert the string to use lower case in php and then use mysql LOWER for the comparison

After

We let mysql do what it does well.

Technical Details

Per #12494 mysql handles lcase.

Adding LOWER to mysql queries makes them slower. lowercasing php strings
breaks under some character sets with some server configs. Less is more

Comments

@seamuslee001 @monishdeb @colemanw I think we should push through on these since we have been chipping away for a few months after this discussion #12494 with no fallout

[civibot]

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[seamuslee001]

Code change looks fine to me, the unit test has enough coverage here that i believe that if there was a problem here then Jenkins would have found it

[seamuslee001]

Merging PR as i am ok with this

[eileenmcnaughton]

Jenkins is good like that :-)

[mfb]

Worth noting that this fix also speeds up queries on many other fields, for example contribution transaction ID.