feat!: move tracing to rely on ctx

[giortzisg]

Description

Modify existing tracing and propagation behavior to rely on context.Context. Tracing now resolves state from context rather than hubs. This includes a breaking change on ContinueTrace removing the need for a hub to be passed.

#skip-changelog

Issues

• resolves: Refactor scope propagation to rely on context.Context #1367
• resolves: GO-154

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Reminders

• Add GH Issue ID & Linear ID
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[linear-code]

GO-154

[cursor]

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