fix: adds the port to superset's metadata sqlalchemy uri

[tecoholic]

Backport of #1267 for 2.5 (Teak) compatible version. More details are available on #1267's description.

NOTE: The target branch is chosen based on the branch name. We are trying to backport this to 2.5.1 (which we are using for our Teak instance).

When MySQL is being served in non-default port, the SUPERSET_METADATA_SQLALCHEMY_URI becomes invalid as there is not explicit port. This commit adds the port to the URI.

Internal-ref: https://tasks.opencraft.com/browse/BB-10779

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[tecoholic]

@farhaanbukhsh Hi, can you review this as CC?

[farhaanbukhsh]

@tecoholic I can :)

[tecoholic]

@farhaanbukhsh If it's helpful - the change to the main is merged in #1267 :)