fix: update approval_prompt=force to prompt=consent (#1752)

* fix: update approval_prompt=force to prompt=consent

* chore: Update test to check to prompt query

Author: lqiu96

oauth2_http/java/com/google/auth/oauth2/UserAuthorizer.java

@@ -206,7 +206,7 @@ public URL getAuthorizationUrl(
       url.put("state", state);
     }
     url.put("access_type", "offline");
-    url.put("approval_prompt", "force");
+    url.put("prompt", "consent");
     if (userId != null) {
       url.put("login_hint", userId);
     }

oauth2_http/javatests/com/google/auth/oauth2/UserAuthorizerTest.java

@@ -207,6 +207,7 @@ public void getAuthorizationUrl() throws IOException {
     assertEquals("code", parameters.get("response_type"));
     assertEquals(pkce.getCodeChallenge(), parameters.get("code_challenge"));
     assertEquals(pkce.getCodeChallengeMethod(), parameters.get("code_challenge_method"));
+    assertEquals("consent", parameters.get("prompt"));
   }
 
   @Test