test: #3618735 Strengthen the Logger functional coverage and stabilize slow-runner steps

Issue: https://www.drupal.org/project/admin_audit_trail/issues/3618735

• Splits the Logger feature into a forwarding feature and a settings feature (folder order runs forwarding first).
• Pins assertions to real behavior: the saved-configuration message, the channel validator's exact text with a paired negative, the persisted channel value round-trip, and the forwarded record's title in the database log message cells.
• Adds an end-to-end PSR-3-only scenario: dblog receives the event, the audit report does not, and hybrid mode is restored at the end so local re-runs against a persistent database stay valid.
• Adds a scan-all-matches "should not contain text" step (the positive step checks only the first match).
• Raises the default step timeout 90s -> 180s: five suite runs on shared CI runners timed out on a single form-submit step while the identical code passed locally and on retry.
• Ignores the failure-dump HTML files varbase-e2e writes next to failure screenshots.

Verified locally: full suite 58/58 scenarios green (307 steps).

AI-Generated: Yes

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
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• Developer Documentation
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• Reviewed by human
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• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release