E2E Testing of accessing course resources

[uier]

Fix #117

• [x] announcements (student)
• announcements (admin)
• [x] homeworks (student)
• homeworks (admin)
• [x] problems (student)
• problems (admin)
• [x] submissions (student)
• submissions (admin)
• members (admin)

testing from admin perspective will be solved in #121

[uier]

admin 的部分得等 testing server 弄好再測了，之後應該會另開 issue

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