Distinguish Practice Tests

[jacbn]

• Splits the listing of available practice tests into its own page, /practice_tests, accessible via the Learn nav;
• Creates a new default table view for /tests (though the original card view is still accessible), which displays the title, assigner and relevant dates;
• Splits assigned tests from practice tests into separate tabs at the topmost level of /tests; further filtering inside these categories (for started, not yet started, overdue and completed) can be achieved via the filters menu

[codecov]

Codecov Report

Attention: Patch coverage is 29.81132% with 186 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@567b7ef). Learn more about missing BASE report.
Report is 63 commits behind head on master.

Files with missing lines	Patch %	Lines
src/app/components/pages/quizzes/MyQuizzes.tsx	12.90%	107 Missing and 1 partial ⚠️
...c/app/components/pages/quizzes/PracticeQuizzes.tsx	27.27%	29 Missing and 3 partials ⚠️
src/app/services/quiz.ts	33.33%	18 Missing and 2 partials ⚠️
...c/app/components/elements/CollapsibleContainer.tsx	23.07%	9 Missing and 1 partial ⚠️
src/app/services/gameboards.tsx	50.00%	4 Missing ⚠️
src/app/components/elements/tables/TableLinks.tsx	62.50%	3 Missing ⚠️
src/app/components/elements/CardGrid.tsx	0.00%	2 Missing ⚠️
...pp/components/elements/quiz/QuizProgressCommon.tsx	50.00%	2 Missing ⚠️
src/app/components/elements/svg/FilterCount.tsx	33.33%	2 Missing ⚠️
src/app/components/elements/CollapsibleList.tsx	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1229   +/-   ##
=========================================
  Coverage          ?   36.64%           
=========================================
  Files             ?      446           
  Lines             ?    19640           
  Branches          ?     6449           
=========================================
  Hits              ?     7198           
  Misses            ?    11798           
  Partials          ?      644           

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