feat(DOJO/mentor): Only display mentor created exercises

[flacial]

Related to #2029

Description

Merging this PR will update the mentor page under /curriculum/[lessonSlug]/mentor to only show the exercises that the mentor created by comparing the exercise author's id to the user session id.

Testing

• Create a module from /admin/lessons/js0/modules
• Create an exercise from /curriculum/js0/mentor/addExercise

1. Go to /curriculum/js0/mentor
2. Confirm the exercise you created are the only ones appearing

Bugs

While pushing, I noticed a flaky test caused by this line in the Exercises page. I couldn't trace back what caused it.

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Name	Status	Preview	Comments	Updated
c0d3-app	✅ Ready (Inspect)	Visit Preview	✅ 5 resolved	Oct 3, 2022 at 0:25AM (UTC)

[codecov]

Codecov Report

Merging #2385 (4dbf634) into master (abe2aca) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2385   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          184       184           
  Lines         3272      3275    +3     
  Branches       863       865    +2     
=========================================
+ Hits          3272      3275    +3     

Impacted Files	Coverage Δ
__dummy__/getExercisesData.ts	100.00% <ø> (ø)
...rriculum/[lessonSlug]/mentor/addExercise/index.tsx	100.00% <100.00%> (ø)
pages/curriculum/[lessonSlug]/mentor/index.tsx	100.00% <100.00%> (ø)