Define release PR to Remove Mock implementations and fix optional description of projectmanager field

Author: Steffengreiner

database-connector/src/main/java/life/qbic/projectmanagement/persistence/ExperimentalDesignRepository.java

@@ -75,15 +75,17 @@ public ProjectInformationDialog() {
 
     principalInvestigator = new ComboBox<>("Principal Investigator");
     principalInvestigator.setPlaceholder("Select a principal investigator");
+    principalInvestigator.setRequired(true);
 
     responsiblePerson = new ComboBox<>("Project Responsible (optional)");
     responsiblePerson.setPlaceholder("Select Project Responsible");
     responsiblePerson.setHelperText("Should be contacted about project related questions");
     //Workaround since combobox does not allow empty selection https://github.com/vaadin/flow-components/issues/1998
     responsiblePerson.setClearButtonVisible(true);
 
-    projectManager = new ComboBox<>("Project Manager (optional)");
+    projectManager = new ComboBox<>("Project Manager");
     projectManager.setPlaceholder("Select a project manager");
+    projectManager.setRequired(true);
 
     createButton = new Button("Create");
     cancelButton = new Button("Cancel");