OZG-5833 fix E2E tests and remove breadcrumb component

...-e2e/src/e2e/main-tests/postfach-mail/postfach-mail.cy.ts

...mail/postfach-mail.filtered-by-organisationseinheit.cy.ts

...s/alfa-e2e/src/page-objects/postfach-mail.component.po.ts

...page-container/postfach-page/postfach-page.component.html

...e-container/postfach-page/postfach-page.component.spec.ts

alfa-client/libs/vorgang-shared-ui/src/index.ts

...r/vorgang-in-postfach-breadcrumb-container.component.html

...r/vorgang-in-postfach-breadcrumb-container.component.scss

...organg-in-postfach-breadcrumb-container.component.spec.ts

...ner/vorgang-in-postfach-breadcrumb-container.component.ts

...-breadcrumb/vorgang-in-postfach-breadcrumb.component.html

...-breadcrumb/vorgang-in-postfach-breadcrumb.component.scss

...eadcrumb/vorgang-in-postfach-breadcrumb.component.spec.ts

...ch-breadcrumb/vorgang-in-postfach-breadcrumb.component.ts

...ibs/vorgang-shared-ui/src/lib/vorgang-shared-ui.module.ts