[E2E] Fix admin datetime flakes (#21440)

* Fix flakes

* Reinforce localization test

frontend/test/metabase/scenarios/admin/settings/localization.cy.spec.js

@@ -160,6 +160,7 @@ describe("scenarios > admin > localization", () => {
   });
 
   it("should use date and time styling settings in the date filter widget (metabase#9151, metabase#12472)", () => {
+    cy.intercept("POST", "/api/dataset").as("dataset");
     cy.intercept("PUT", "/api/setting/custom-formatting").as(
       "updateFormatting",
     );
@@ -170,17 +171,17 @@ describe("scenarios > admin > localization", () => {
     cy.findByText("January 7, 2018").click();
     cy.findByText("2018/1/7").click();
     cy.wait("@updateFormatting");
+    cy.findAllByTestId("select-button-content").should("contain", "2018/1/7");
 
     // update the time style setting to 24 hour
     cy.findByText("17:24 (24-hour clock)").click();
     cy.wait("@updateFormatting");
+    cy.findByDisplayValue("HH:mm").should("be.checked");
 
     visitQuestion(1);
-    cy.findByTestId("loading-spinner").should("not.exist");
-    cy.findByTextEnsureVisible("Product ID");
 
     // create a date filter and set it to the 'On' view to see a specific date
-    cy.findByText("Created At").click();
+    cy.findByTextEnsureVisible("Created At").click();
     cy.findByText("Filter by this column").click();
     cy.findByText("Previous").click();
     cy.findByText("On").click();
@@ -210,7 +211,8 @@ describe("scenarios > admin > localization", () => {
       .type("56");
 
     // apply the date filter
-    cy.findByText("Update filter").click();
+    cy.button("Update filter").click();
+    cy.wait("@dataset");
 
     cy.findByTestId("loading-spinner").should("not.exist");
 

frontend/test/metabase/scenarios/admin/settings/settings.cy.spec.js

@@ -175,9 +175,11 @@ describe("scenarios > admin > settings", () => {
     cy.findByText("January 7, 2018").click({ force: true });
     cy.findByText("2018/1/7").click({ force: true });
     cy.wait("@saveFormatting");
+    cy.findAllByTestId("select-button-content").should("contain", "2018/1/7");
 
     cy.findByText("17:24 (24-hour clock)").click();
     cy.wait("@saveFormatting");
+    cy.findByDisplayValue("HH:mm").should("be.checked");
 
     openOrdersTable({ limit: 2 });
 
@@ -191,6 +193,7 @@ describe("scenarios > admin > settings", () => {
 
     cy.findByText("5:24 PM (12-hour clock)").click();
     cy.wait("@saveFormatting");
+    cy.findByDisplayValue("h:mm A").should("be.checked");
 
     openOrdersTable({ limit: 2 });