v4

MET-3528 Tech-debt: Use separate statements for assignment
MET-3529 Tech-debt: Remove unknown pseudo-class :visible
MET-3523 Tech-debt: Remove old-style for loops
MET-3522 Tech-debt: Remove unknown type selector 'app-sortable-group'
MET-3525 Tech-debt: Replace deprecated "flatMap" function
MET-3524 Tech-debt: Remove (or merge) duplicate imports
MET-3473 Tech-debt: Extract Ternary Operatiors
MET-3467 Tech-debt: Fix SonarQube Errors in filter-ops-conf
MET-3466 Tech-debt: Fix Depublication-Related SonarQube Errors
MET-3475 Tech-debt: Remove illegal non-null assertions in the workflow-header component
MET-3449 Tech-debt: Replace Date Check Regex
MET-3465 Tech-debt: Fix "Blocker" issues in SonarQube
MET-3471 Tech-debt: Add Aria-Label
MET-3472 Tech-debt: Fix-Equality-Test
MET-3474 Tech-debt: Replace String wrapper with string primitive
MET-3470 Tech-debt: Mark ReadOnly Services
MET-3530 Tech-debt: Remove "forbidden non null assertions"
MET-3519 Tech-debt: Fix SonarQube CSS Report"
MET-3349 Make reusable Angular component for protocol radios
MET-3344 Set up test data server for Sandbox
MET-3319 Create placeholder application for Sandbox
MET-3340 Replace placeholder application with functional code
MET-3316 Reconfigure as Angular workspace
MET-3490 Display in UI all Countries and Languages options
MET-3491 DatasetName and Track dataset ID input are validated as part of the Sandbox form
MET-2275 Add OAI incremental option
MET-3412 Develop Progress Tracker Component
MET-3493 Addition of some visual elements from Metis into the Sandbox
MET-3537 Display dataset information in UI