array_key_exists(): Argument #1 ($key) must be a valid array offset type

Problem/Motivation

In php 8.0 and above if we pass an array to the first argument in array_key_exists($title, $replacedTitles) we got an error array_key_exists(): Argument #1 ($key) must be a valid array offset type in easy_breadcrumb/src/EasyBreadcrumbBuilder.php on line 49
In some cases, the $title may be a markable array or translatable array.

Steps to reproduce

• You should be using php 8.1
• install easy breadcrump and commerce recurring module
• create a subscription
• try to edit the subscription and you will get the error

also, you can create a custom entity or alter an existing entity and return a t('test') in the label function for the entity

Proposed resolution

Add is_string check, and don't run array_key_exists if the $title is not a string

Remaining tasks

patch and PR

User interface changes

none

API changes

none

Data model changes

none