fix: prevent false-positive major bumps from breaking change detection

[FabienMotte]

Summary

• Fix false-positive major version bumps when commit bodies contain the words "breaking changes" in prose (e.g. "This PR includes breaking changes around package consolidation")
• Require the BREAKING CHANGE: / BREAKING-CHANGE: footer colon separator per the Conventional Commits spec
• Add support for the ! suffix in commit titles (e.g. feat!:, fix(scope)!:) to trigger major bumps
• Strip trailing ! from prefixes in getCommitNumbersPerType so feat!: is correctly classified as feat

Test plan

• Added test: prose mentioning "breaking changes" does not trigger major
• Added test: BREAKING-CHANGE: (hyphen variant) triggers major
• Added test: feat!: triggers major
• Added test: fix(scope)!: triggers major
• All existing tests still pass

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 duplication

Metric	Results
Duplication	0

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[Copilot]

Pull request overview

This PR tightens ShipJS’ major-version bump detection to better follow Conventional Commits: it avoids triggering majors from incidental prose, and adds support for the ! header marker while requiring the BREAKING CHANGE: / BREAKING-CHANGE: footer format.

Changes:

• Require BREAKING CHANGE: / BREAKING-CHANGE: (with :) for major bump detection in commit bodies (reduces false positives).
• Detect major bumps from ! in commit titles (e.g., feat!:, fix(scope)!:).
• Normalize commit type parsing so feat!: is counted as feat for minor/patch classification logic.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/shipjs-lib/src/lib/util/getNextVersion.js	Updates major bump detection to use a breaking-change footer regex and adds !-header major detection.
packages/shipjs-lib/src/lib/util/getCommitNumbersPerType.js	Strips trailing ! from parsed commit type so feat!: is classified correctly.
packages/shipjs-lib/src/lib/util/tests/getNextVersion.spec.js	Adds tests for hyphenated footer detection, prose false-positive prevention, and ! title handling.
packages/shipjs-lib/src/lib/const.js	Changes GIT_COMMIT_BREAKING_CHANGE from a string to a regex aligned with the spec.

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[dhayab]

Great fix, thanks!