Issue #3588996: Remove DeprecationHelper::backwardsCompatibleCall for Drupal...

Ide Braakmanrequested to merge
issue/diff-3588996:3588996-remove-backwards-compatible-calls into 2.x

Issue #3588996: Remove DeprecationHelper::backwardsCompatibleCall for Drupal versions that are no longer supported

Closes #3588996

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