Merge branch 'master' into code-improvements

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

...tests/postfach-mail/postfach-nachricht-reply-button.cy.ts

alfa-client/apps/alfa-e2e/src/fixtures/vorgang/vorgang.json

alfa-client/apps/alfa-e2e/src/model/vorgang.ts

alfa-client/apps/demo/src/app/app.component.html

alfa-client/apps/demo/src/app/app.component.ts

...n-date-container/beschieden-date-container.component.html

alfa-client/libs/collaboration-shared/.eslintrc.json

alfa-client/libs/collaboration-shared/README.md

alfa-client/libs/collaboration-shared/jest.config.ts

alfa-client/libs/collaboration-shared/project.json

alfa-client/libs/collaboration-shared/src/index.ts

...ration-shared/src/lib/collaboration-shared.module.spec.ts

...llaboration-shared/src/lib/collaboration-shared.module.ts

...ollaboration-shared/src/lib/collaboration.service.spec.ts

...ibs/collaboration-shared/src/lib/collaboration.service.ts

alfa-client/libs/collaboration-shared/src/test-setup.ts

alfa-client/libs/collaboration-shared/tsconfig.json

alfa-client/libs/collaboration-shared/tsconfig.lib.json

alfa-client/libs/collaboration-shared/tsconfig.spec.json