fix: #3633480 Skip bracketed text whose pipes are all inside quotes (2.x)

Skips the match when the quote-aware split gives a single part, so the token service is not called on the same text again. The new kernel test fails on 2.3.3 and 3.0.0-beta1.

Issue: https://www.drupal.org/project/token_or/issues/3633480

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