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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Re-add common PDO tests to Firebird test suite

These have been inadvertently dropped when changing the test suite to
not require ext/interbase anymore, so we add them back.

We a

Re-add common PDO tests to Firebird test suite

These have been inadvertently dropped when changing the test suite to
not require ext/interbase anymore, so we add them back.

We also change the required environment variable names to match the
usual PDO names. Particularly, we replace `PDO_FIREBIRD_TEST_HOSTNAME`
and `_DATABASE` with the more flexible `PDO_FIREBIRD_TEST_DSN`.

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Rewrite PDO_Firebird tests to not depend on ext/interbase

I have no idea how I managed to get this to work, but there is 4 new environment variables that
can be specified for the connect

Rewrite PDO_Firebird tests to not depend on ext/interbase

I have no idea how I managed to get this to work, but there is 4 new environment variables that
can be specified for the connection:

- PDO_FIREBIRD_USERNAME
- PDO_FIREBIRD_PASSWORD
- PDO_FIREBIRD_HOSTNAME
- PDO_FIREBIRD_DATABASE

(See testdb.inc for more info)

The only way I could get this to work on my local machine was with a DSN like:

- firebird:dbname=localhost:C:\php.fdb

Hence why the 'hostname' can be specified.

There is also a bit mess in regards to cleanup of this extension tests, but I really do not want to dwell down there, if someone dares to do so, then please be my guest.

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Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Trim trailing whitespace in tests

- Fix tests

use new tests