Implemented the customer installed-base view

src/content/modal.js

@@ -26,6 +26,7 @@ function createContentModal({
   applyTheme,
   authSessionState,
   closeAccountPlansModal,
+  closeInstallBaseModal,
   closeCustomerFilterPanel,
   closeOwnerFilterPanel,
   closePreferencesModal,
@@ -432,6 +433,7 @@ function createContentModal({
     if (modal) {
       closePreferencesModal();
       closeAccountPlansModal();
+      closeInstallBaseModal();
       modal.hidden = true;
     }
 
@@ -460,6 +462,10 @@ function createContentModal({
       }
 
       if (event.key === "Escape") {
+        if (closeInstallBaseModal()) {
+          event.preventDefault();
+          return;
+        }
         const accountPlansModal = document.getElementById(ACCOUNT_PLANS_MODAL_ID);
 
         if (accountPlansModal && !accountPlansModal.hidden) {