refactor(gmail_client): remove explicit level attrs from tracing instruments

[evanhutnik]

Summary

• Removes all explicit level = "info" and level = "debug" attributes from #[tracing::instrument] macros in the gmail_client crate
• Lets tracing use default levels instead of overriding them per-function
• Affects 6 instrument annotations across lib.rs, labels.rs, threads.rs, and profile.rs

Test plan

• cargo check -p gmail_client passes
• CI passes

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: baa6f288-c80a-42f1-96d9-9facf61ed7b6

📥 Commits

Reviewing files that changed from the base of the PR and between f4324fe and 5935024.

📒 Files selected for processing (4)

• rust/cloud-storage/gmail_client/src/labels.rs
• rust/cloud-storage/gmail_client/src/lib.rs
• rust/cloud-storage/gmail_client/src/profile.rs
• rust/cloud-storage/gmail_client/src/threads.rs

💤 Files with no reviewable changes (1)

• rust/cloud-storage/gmail_client/src/labels.rs

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Walkthrough

This pull request removes explicit log-level configurations from tracing instrumentation attributes across four files in the gmail_client module. The #[tracing::instrument] macros on modify_message_labels, delete_gmail_label, batch_modify_labels, get_profile_threads_total, and get_threads_with_retry are updated to eliminate their level parameters (either "debug" or "info"). The functions' logic, public signatures, and other instrumentation parameters remain unchanged. This allows the tracing framework to use its default log levels instead of explicit overrides.

Poem

🐰 Trace levels fall away like morning dew,
Default paths now guide our debugging through,
No explicit levels—just the span's own way,
Cleaner code hops forward into the day!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: removing explicit level attributes from tracing instrument macros in the gmail_client crate.
Description check	✅ Passed	The description is directly related to the changeset, clearly explaining what was removed and why (letting tracing use default levels), with specific file references and a test plan.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch evan/remove-gmail-level-attrs

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