스낵바가 보이는지 확인하는 테스트가 불안정함

[jja08111]

아래의 스낵바를 이용하여 assertion하는 테스트가 가끔 실패함.

> Task :presentation:connectedDebugAndroidTest
[578](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:582)
Starting 79 tests on test(AVD) - 6.0
[579](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:583)

[580](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:584)
com.pocs.presentation.PostFragmentTest > shouldShowNoPermissionSnackBar_WhenAnonymousClickNonQnaPost[test(AVD) - 6.0] FAILED 
[581](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:585)
	androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: an instance of android.widget.TextView and view.getText() equals string from resource id: <2131951662> [can_see_only_member] value: 회원만 열람할 수 있습니다.
[582](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:586)
	
[583](https://github.com/hansung-pocs/blog-android/runs/7994045681?check_suite_focus=true#step:7:587)
Tests on test(AVD) - 6.0 failed: There was 1 failure(s).