fix(ui5-time-picker): update test for CLDR 48 Bulgarian time format

Bulgarian medium time format changed from "H:mm:ss 'ч.'" to "H:mm:ss"
in CLDR 48. Move setLanguage("en") cleanup to afterEach to prevent
locale leak when assertions fail.

Author: ilhan007

packages/main/cypress/specs/TimePicker.cy.tsx

@@ -24,7 +24,7 @@ describe("TimePicker Tests", () => {
 
 		cy.get<TimePicker>("@timePicker")
 			.ui5TimePickerGetInnerInput()
-			.should("have.value", "3:16:16 ч.");
+			.should("have.value", "3:16:16");
 
 		cy.wrap({ setLanguage })
 			.then(api => {