fix: 쉼표를 포함한 타이틀이더라도 시간과 메모리 정보를 안정적으로 수집하도록 변경

[utact]

🚀 작업 배경

정규표현식에 허점이 있어 성공 기록을 실패로 취급하는 이슈가 발생했습니다.

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🛠️ 주요 변경 사항

• 타이틀에 쉼표가 포함되어 있더라도 성공/실패를 정상적으로 판단합니다.

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🔗 관련 이슈

• 이메일 제보

[Copilot]

Pull request overview

This PR fixes a regex pattern bug in GitHubSubmissionMetadataExtractor that incorrectly treated successful submissions as failures when the problem title contained commas.

Changes:

• Updated the commit message regex pattern to use non-greedy matching (.+?) instead of non-comma matching ([^,]+) for the title field
• Added a test case to verify that titles containing commas are correctly parsed

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
backend/src/main/java/com/ssafy/dash/github/application/GitHubSubmissionMetadataExtractor.java	Changed regex pattern from [^,]+ to .+? for title capture group to support titles with commas
backend/src/test/java/com/ssafy/dash/github/application/GitHubSubmissionMetadataExtractorTest.java	Added test case for commit messages with commas in the title (e.g., "큰 놈, 작은 놈, 같은 놈")

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