Remove serverTimezone=UTC parameter at MySQLConnectionPropertiesParser and E2E

[azexcy]

Because of upgrade to MySQL Connector/J 8.x, Configuring serverTimezone alone is effective, however, the default time zone in the program is used whenserverTimezone is configured individually in MySQL Connector/J 5.1.x

So, it's better add the parameter manually if needed

refer

1. https://dev.mysql.com/doc/refman/8.0/en/time-zone-support.html
2. https://dev.mysql.com/doc/connectors/en/connector-j-time-instants.html
3. https://dev.mysql.com/doc/relnotes/connector-j/8.0/en/news-8-0-23.html

Changes proposed in this pull request:

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[azexcy]

Related code com.mysql.cj.protocol.a.NativeProtocol