DriverTest::testDatabaseParameters() is unstable

[morozov]

Q	A
BC Break	no
Version	2.10.0-dev

In the last couple of weeks, I've seen this test failing a few times for no reason.

When running against PostgreSQL, it may fail like this:

1) Warning
The data provider specified for Doctrine\Tests\DBAL\Functional\Driver\PDOPgSql\DriverTest::testDatabaseParameters is invalid.
An exception occurred in driver: SQLSTATE[08006] [7] server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.

When running against MySQL (yes), it may fail like this:

1) Warning
The data provider specified for Doctrine\Tests\DBAL\Functional\Driver\PDOPgSql\DriverTest::testDatabaseParameters is invalid.
An exception occurred in driver: SQLSTATE[HY000] [2006] MySQL server has gone away

In its data provider, the test tries to detect the database name specified in the connection parameters and by that triggers the database connection while the database seems to be not yet ready.

[Majkl578]

Relevant PR: #3426

[github-actions]

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