Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Disable LSan for all PDO_Firebird tests

The tests leak memory, likely due to a slightly unclean shutdown of
libfbclient. To avoid failing CI, we disable LSan for all the tests.

Disable LSan for all PDO_Firebird tests

The tests leak memory, likely due to a slightly unclean shutdown of
libfbclient. To avoid failing CI, we disable LSan for all the tests.

Closes GH-6966.

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Add simple Firebird payload fake server to test suite

This is meant to test against certain fixed responses of Firebird
servers. For now we add just a most basic test which verifies a

Add simple Firebird payload fake server to test suite

This is meant to test against certain fixed responses of Firebird
servers. For now we add just a most basic test which verifies a
connection attempt.

Closes GH-6940.

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