feat(attributes): Add sentry.segment.name.source attribute

[Lms24]

Adds a new sentry.segment.name.source attribute almost replaces the sentry.span.source attribute. The values shall stay the same. But this attribute will be exclusively set on segment spans and not on child spans.

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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New Features ✨

Attributes

• Add sentry.segment.name.source attribute by Lms24 in #466

• Add db.response.status_code by s1gr1d in #462

Other

• (ai) Add granular cost attributes for cache and reasoning by vgrozdanic in #461

Internal Changes 🔧

• (ci) Stop inheriting secrets for changelog-preview by tobias-wilfert in #463

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