[OPENJPA-2940] Add transformedBitIsBoolean=true to MySQL JDBC test URL

MySQL stores BOOLEAN columns as TINYINT(1). By default, MySQL Connector/J
reports them as Types.BIT, which OpenJPA's MappingInfo.mergeColumn
coerces as "numeric" and silently upgrades to VARCHAR — defeating
SchemaManager.validate() detection of a genuine VARCHAR->BOOLEAN schema
drift (TestJDBCSchemaManager.testValidate).

Setting transformedBitIsBoolean=true makes Connector/J report TINYINT(1)
as Types.BOOLEAN, which isNumericType() excludes. This matches MariaDB
Connector/J's default behavior where the same test already passes.

Author: rzo1

pom.xml

@@ -651,7 +651,7 @@
                 <!-- default settings for local docker -->
                 <docker.external.mysql.port>3306</docker.external.mysql.port>
                 <openjpa.mysql.dbname>openjpatst</openjpa.mysql.dbname>
-                <openjpa.mysql.url>jdbc:mysql://localhost:${docker.external.mysql.port}/${openjpa.mysql.dbname}?useSSL=false</openjpa.mysql.url>
+                <openjpa.mysql.url>jdbc:mysql://localhost:${docker.external.mysql.port}/${openjpa.mysql.dbname}?useSSL=false&amp;transformedBitIsBoolean=true</openjpa.mysql.url>
                 <openjpa.mysql.username>openjpatst</openjpa.mysql.username>
                 <openjpa.mysql.password>openjpatst</openjpa.mysql.password>