feat: Add support for MySQL database, fixes RHOAIENG-3246, RHOAIENG-3247

[dhirajsb]

Description

How Has This Been Tested?

Unit test updated to test both DB configs.
Tested locally by using the updated mysql and postgres samples.

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dhirajsb]

MySQL test is timing out. Will take a look in the morning.

[dhirajsb]

For some reason the mysql DB in the ci Kind cluster fails to start with the error:

mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'
Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!

But the same mysql 8.3.0 image runs fine in a local Kind cluster and a ROSA OpenShift cluster.
I've switched the test back to using postgres so that this Kind test for CI can pass. It still exercises the operator template changes so it's a valid test.

[lampajr]

lgtm