refactor: centralize branch tracing into BranchTracing helper

[dkrizan]

Summary

Alternative approach to the tracing attribute-setting in #3464 — as discussed in this review comment.

Instead of scattering Span.current().setAttribute() calls and private fun set*TracingAttributes() methods in each service, this introduces a shared BranchTracing component with one high-level method per operation type.

What changes:

• New BranchTracing component in backend/data with typed, explicit methods: traceCopy(), traceDryRunMerge(), traceApplyMerge(), traceCreateBranch()
• Services call a single method instead of multiple raw span attribute calls
• No TolgeeTracingContext injection needed in services (only BranchTracing)
• All private fun set*TracingAttributes() helper methods removed from services
• @WithSpan annotations kept as-is

Before (current PR):

private fun setDryRunTracingAttributes(sourceBranch: Branch, targetBranch: Branch) {
    tracingContext.setContext(sourceBranch.project.id, null)
    val span = Span.current()
    span.setAttribute("tolgee.branch.source.id", sourceBranch.id)
    span.setAttribute("tolgee.branch.source.name", sourceBranch.name)
    span.setAttribute("tolgee.branch.target.id", targetBranch.id)
    span.setAttribute("tolgee.branch.target.name", targetBranch.name)
}

After:

branchTracing.traceDryRunMerge(sourceBranch, targetBranch)

Test plan

• Verify span attributes match the original PR's output in Grafana/Tempo
• Confirm @WithSpan creates spans as before

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.