chore: move utils test files to src directory

[devin-ai-integration]

Moved the test files from packages/shortest/tests/unit/utils/* to packages/shortest/src/utils/* as requested. Updated import paths where needed. No functional changes were made.

Link to Devin run: https://app.devin.ai/sessions/9ecf237e97104a348c54181e49d4d7d4
Requested by: Razvan Marescu ([email protected])

[devin-ai-integration]

Original prompt from Razvan:

Received message in Slack channel #shortest:

@Devin, for antiwork/shortest, move the test files from packages/shortest/tests/unit/utils* to packages/shortest/src/utils/*
Basically, the test files should be moved along with the files they are testing.

* Do not make any functional changes, move the files as-is
* Update import paths IF needed

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Name	Status	Preview	Comments	Updated (UTC)
shortest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2025 3:12am

[devin-ai-integration]

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