[Tooling] Add no-unused-modules rule to eslint

[yonikid15]

🤖 Resolves #7453

👋 Introduction

• Add no-unused-modules rule to eslint. Rule runs on CI, but not locally

🧪 Testing

1. Run pnpm run lint
2. Ensure rule isn't applied locally

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.00000% with 24 lines in your changes missing coverage. Please review.

Project coverage is 38.53%. Comparing base (90b330b) to head (dff806e).

Files	Patch %	Lines
apps/web/src/utils/educationUtils.tsx	20.00%	4 Missing ⚠️
...eb/src/components/Instructions/InstructionList.tsx	0.00%	2 Missing ⚠️
...eb/src/components/Instructions/InstructionStep.tsx	0.00%	2 Missing ⚠️
apps/web/src/components/Instructions/index.ts	0.00%	2 Missing ⚠️
.../AnnouncementsPage/SitewideAnnouncementSection.tsx	0.00%	2 Missing ⚠️
...components/NotificationList/NotificationPortal.tsx	0.00%	1 Missing ⚠️
.../ApplicationInformation/ApplicationInformation.tsx	0.00%	1 Missing ⚠️
...CandidatePage/components/MoreActions/NotesForm.tsx	0.00%	1 Missing ⚠️
...cruitmentPage/CareerTimelineAndRecruitmentPage.tsx	0.00%	1 Missing ⚠️
...ntPage/components/CareerTimelineAndRecruitment.tsx	0.00%	1 Missing ⚠️
... and 7 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10741      +/-   ##
============================================
+ Coverage     38.26%   38.53%   +0.26%     
  Complexity     1652     1652              
============================================
  Files          1021     1012       -9     
  Lines         31207    30811     -396     
  Branches       6522     6422     -100     
============================================
- Hits          11942    11872      -70     
+ Misses        19100    18903     -197     
+ Partials        165       36     -129     

Flag	Coverage Δ
integrationtests	67.89% <ø> (+0.09%)	⬆️
unittests	31.35% <40.00%> (+0.19%)	⬆️

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[petertgiles]

Wow, a lot of dead code hacked out. 👏
I left a few style comments but nothing blocking.