Issue #2500535 by quietone, phenaproxima: Upgrade path for Tracker 7.x

...modules/migrate_drupal/src/Tests/Table/d7/TrackerUser.php

core/modules/tracker/migration_templates/d7_tracker_node.yml

core/modules/tracker/migration_templates/d7_tracker_user.yml

...ules/tracker/src/Plugin/migrate/source/d7/TrackerNode.php

...ules/tracker/src/Plugin/migrate/source/d7/TrackerUser.php

...s/tracker/src/Tests/Migrate/d7/MigrateTrackerNodeTest.php

...s/tracker/src/Tests/Migrate/d7/MigrateTrackerUserTest.php

...sts/src/Unit/Plugin/migrate/source/d7/TrackerNodeTest.php

...sts/src/Unit/Plugin/migrate/source/d7/TrackerUserTest.php