Update ischool login method with retry mechanism

[James-Lu-none]

Description

• add retry mechanism on ischool login method.

Implementation

sso index retiving process

• process will retry on sso index retriving failure.

redirection process

• process will retry when redirection was not introduced (status code != 302)
• process will retry when connection loss to ischool

Testing Instructions

Please provide details on the steps required to review and test this PR.

• try features related to ischool campus or run ischool_plus_connector_test.dart

Additional Notes

i haven't got any error during the tests that i perform in the development, so please try the login methods as much as you can in order to provide more information for error handling or optimizing retry mechanism, and the error handling might be performed by expending ISchoolPlusConnectorStatus status.

[rileychh]

A warning "This course does not support queries" whenever querying for announcements of any course. Debug output:

[TAT (core) _SimpleLoginRepositoryImpl simpleLoginWithCredential fetchInitialJSessionIdCookie] Initial JSESSIONID have tried to get.
E/FA      (14508): Name is reserved. Type, name: user property, user_id
[TAT (core) _SimpleLoginRepositoryImpl simpleLoginWithCredential SimpleLoginResultDto.fromJson] SimpleLoginResultDto created.
E/ub.ntut.npc.tat(14508): PIXEL: ioctl err: 1
[TAT (core) _CheckSessionRepositoryImpl isValidSession fetch checkSession] Fetched session status: {
  "success" : true
}

[TAT (core) _CheckSessionRepositoryImpl isValidSession verify "true" in data] Is the session response data contains "true": true
I/flutter (14508): ----------------FIREBASE CRASHLYTICS----------------
I/flutter (14508): NoSuchMethodError: The method 'getElementsByTagName' was called on null.
I/flutter (14508): Receiver: null
I/flutter (14508): Tried calling: getElementsByTagName("option")
I/flutter (14508): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:38:5)
I/flutter (14508): #1      ISchoolPlusConnector._selectCourse (package:flutter_app/src/connector/ischool_plus_connector.dart:494:20)
I/flutter (14508): <asynchronous suspension>
I/flutter (14508): #2      ISchoolPlusConnector.getCourseAnnouncement (package:flutter_app/src/connector/ischool_plus_connector.dart:258:12)
I/flutter (14508): <asynchronous suspension>
I/flutter (14508): #3      IPlusCourseAnnouncementTask.execute (package:flutter_app/src/task/iplus/iplus_course_announcement_task.dart:22:21)
I/flutter (14508): <asynchronous suspension>
I/flutter (14508): #4      TaskFlow.start (package:flutter_app/src/task/task_flow.dart:52:22)
I/flutter (14508): <asynchronous suspension>
I/flutter (14508): #5      _IPlusAnnouncementPage._addTask (package:flutter_app/ui/pages/coursedetail/screen/ischoolplus/iplus_announcement_page.dart:50:9)
I/flutter (14508): <asynchronous suspension>

[ntut-xuan]

IWOMM.

[ntut-xuan]

IWOMM.

Since the review is 2 weeks ago and no further response, dismiss it.