chore(OBE-11298): add Qodo PR agent config

[JuanMantica45]

Summary

Adds .pr_agent.toml to onboard this repo to Qodo (SentinelOne's AI code-review platform), using the same quiet-hardened Balanced preset already merged in manager and now proposed for pipeline, common, helm, and dataplane-private.

The preset turns off two noisy stock defaults flagged during the Qodo pilot:

• enable_auto_checks_feedback = false — suppresses full CI-log-dump comments, which add no signal beyond the check itself.
• pr_commands = ["/agentic_review"] — drops Qodo's auto-describe comment, which is redundant with our own PR descriptions.

The TODO: VERIFY comment about prefer_single_line_comments is carried over verbatim: pilot feedback recommended it, but it is not a documented Qodo config key (config reference), so it is deliberately left unset rather than shipped as a silent no-op.

Why

Config-only, so that when the Qodo app is installed on this repo it reviews with low-noise defaults from day one instead of the stock preset. Keeping the file byte-identical across our repos (apart from the repo name in the header comment) means they all behave the same under review and can be retuned in one pass.

Note: unlike our GitHub Enterprise repos, this repo lives on github.com, so the Qodo app installation is not covered by the s1-ghe-admin allowlist — that has to be arranged separately. This PR only lands the config.

Ticket: OBE-11298

Test plan

• Config-only change; no Rust code touched, no behavior to unit test.
• Verified .pr_agent.toml parses as valid TOML.
• Verified the file body is byte-identical to the version merged in manager.

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