FEAT(mapping): add 2 methods to MetaTaxonomyController

setBreadcrumbs()
getBaseUrl()
   returns the base URL of the mapping
   based on the user's language

Refs: #788
4 jobs for 849_mapping in 2 minutes and 53 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #31123
composer_validate

00:00:38

passed #31124
php-lint

00:00:40

passed #31125
phpcs

00:00:39

passed #31126
phpunit

00:02:51

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