fix: fix spelling errors in test files

[FrankFMY]

Summary

• Fix hadnler -> handler in test/js/web/fetch/abort-signal-leak.test.ts
• Fix self asign -> self-signed in test/js/node/tls/node-tls-connect.test.ts
• Fix succesfully -> successfully in test/cli/install/bun-add.test.ts
• Fix occurences -> occurrences in test/cli/install/hosted-git-info/cases.ts

[coderabbitai]

Walkthrough

This pull request contains minor typographical corrections across test files, including comment typos and test naming improvements. No functional or behavioral changes are introduced.

Changes

Cohort / File(s)	Summary
CLI Tests test/cli/install/bun-add.test.ts, test/cli/install/hosted-git-info/cases.ts	Fixed comment typos: "succesfully" corrected to "successfully" and "occurrences" corrected in comments.
JS Runtime Tests test/js/node/tls/node-tls-connect.test.ts, test/js/web/fetch/abort-signal-leak.test.ts	Fixed test naming: "self asign" corrected to "self-signed" and "hadnler" corrected to "handler".

🚥 Pre-merge checks | ✅ 1 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description provides a summary of all spelling fixes but lacks the structured sections required by the template (What does this PR do? and How did you verify your code works?).	Expand the description to follow the template structure with dedicated sections for 'What does this PR do?' and 'How did you verify your code works?'.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing spelling errors across multiple test files.

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