ref(develop/spans): Replace sentry.span.source with sentry.segment.name.source common attribute

[Lms24]

DESCRIBE YOUR PR

Replaces the sentry.span.source attribute (deprecation pending via getsentry/sentry-conventions#510) with sentry.segment.name.source which must now exclusively be set on segment spans.

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LEGAL BOILERPLATE

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[github-actions]

⚠️ Redirect Chain Issues Detected

This PR introduces or contains redirect chains that degrade SEO and add latency.

Content Links Pointing to Redirects (1 found)

These links point to URLs that redirect. Update them to point directly to the final destination:

File	Line	Current Link	Should Be
docs/platforms/python/tracing/configure-sampling/index.mdx	607	/platforms/python/configuration/sampling/#sampling-context	/platforms/python/sampling/#sampling-context

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Each redirect hop loses ~15% of SEO link equity and adds latency for users.