8 string references to breadcrumb in Drupal 10

block.block.claro_breadcrumbs.yml in core/themes/claro/config/optional/block.block.claro_breadcrumbs.yml

core/themes/claro/config/optional/block.block.claro_breadcrumbs.yml

block.block.olivero_breadcrumbs.yml in core/themes/olivero/config/optional/block.block.olivero_breadcrumbs.yml

core/themes/olivero/config/optional/block.block.olivero_breadcrumbs.yml

Breadcrumb404Test::testBreadcrumbOn404Pages in core/tests/Drupal/FunctionalTests/Breadcrumb/Breadcrumb404Test.php

Tests that different 404s don't create unnecessary cache entries.

d7_block.yml in core/modules/block/migrations/d7_block.yml

core/modules/block/migrations/d7_block.yml

drupal_common_theme in core/includes/theme.inc

Provides theme registration for themes across .inc files.

SystemBreadcrumbBlock::create in core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php

template_preprocess_breadcrumb in core/includes/theme.inc

Prepares variables for breadcrumb templates.

ThemeExtensionList.php in core/lib/Drupal/Core/Extension/ThemeExtensionList.php