fix: change teacher dashboard tab design to standard tabs

[jfdoming]

Notion ticket link

Update Teacher Dashboard test sessions to use existing tab design

Implementation description

• Update tabs on teacher dashboard to use the normal design

Steps to test

1. View tabs

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[jfdoming]

[github-actions]

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[carissa-tang]

nice!