Prepend jdbc: to DatabaseMetaData.getURL result

[misterjpapa]

Fixed the PrestoDatabaseMetaData implementation of the getURL method to
include the jdbc: prefix in the resulting URL. A JDBC URL always starts with
jdbc:.

Added an unit and a product test to verify that the database connection URL
starts with the expected jdbc: prefix.

Description

Append the jdbc: prefix to the URL that is returned from the
PrestoDatabaseMetaData implementation of the getURL method.

Motivation and Context

A JDBC URL return from the getURL method of the
DatabaseMetaData interface provides a way of identifying a
database so that the appropriate driver recognizes it and
connects to it. A JDBC URL always starts with jdbc: which was
lacking in the current PrestoDatabaseMetaData implementation
of the getURL method.
#19312

Impact

Callers of the method PrestoDatabaseMetaData.getURL will be
able to use the resulting URL directly without having to prepend
the jdbc: prefix themselves.

Test Plan

Added a unit test in the TestPrestoDatabaseMetaData class and
a product test in JdbcTests class that asserts the URL starts with t
the jdbc: prefix and the rest of the URL did not change.

Contributor checklist

• Please make sure your submission complies with our development, formatting, commit message, and attribution guidelines.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• If release notes are required, they follow the release notes guidelines.
• Adequate tests were added if applicable.
• CI passed.

Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

JDBC
* Fix the PrestoDatabaseMetaData.getURL method to include the jdbc: prefix in the returned URL :pr:`23397`

[tdcmeehan]

Thanks @misterjpapa