Fix failing tests on PHP images and ImageMagick versions for 6.6

[desrosj]

This backports the following to restore a passing build in the 6.7 branch:

• b6e708d for fixing the TLS/SSL connection issue in newer PHP 8.x containers (see Core-63876).
• 9ca38ce to skip add media tests that currently fail on ImageMagick 7.x, and improves error handling within tests (see Core-63932).

Trac ticket: Core-63876

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[desrosj]

https://core.trac.wordpress.org/changeset/60746