style: apply rustfmt to the BES tracing sink

[thesayyn]

Fixes the format-gha / format-gha-debug / format-format-repeat-task failures on #1369. The format task reported exactly one unformatted file, crates/axl-runtime/src/engine/bazel/sink/tracing.rs:

• both TestStatus::try_from(...).unwrap_or(...) bindings wrapped on the wrong side of the call
• the multi-argument assert_eq!s in the new tests exceeded the line width
• the Timestamp { seconds: 42, nanos: 0 } literal needed expanding

Produced by running cargo fmt --all; cargo fmt --all -- --check is now clean across the workspace.

Based on claude/axl-cli-otel-test-spans-52xxpx so the diff is only the formatting change. Merging it into that branch turns #1369's format checks green.

Changes are visible to end-users: no

Whitespace and line wrapping only — no behavior change.

Test plan

• cargo fmt --all -- --check passes with no diff
• cargo test -p axl-runtime --lib engine::bazel::sink::tracing — 6 passed, 0 failed

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[thesayyn]

Closing as redundant — the rustfmt commit (73f9f29) was pushed directly onto claude/axl-cli-otel-test-spans-52xxpx instead, so it now rides along with #1369 and re-triggers its CI.

This PR could never have been verified on its own: ci-workflows.yaml triggers on pull_request: branches: [main], and this one targeted a feature branch, so none of the aspect / * checks ever registered against its head.

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