feat: Add get aicr_settings command to view AI Code Review configuration for a repo

[BlueLabelscotch]

Description:

Problem

There's currently no CLI command to inspect a repo's AI Code Review (AICR)
settings. Users can view AICR results on a PR (get pr:insight), but not
whether/how AICR is configured for a repo (enabled/disabled, recursive
inheritance from parent scopes, rule configuration, etc.).

Proposed command

harness get aicr_settings --repo <repo> (naming TBD — could also be
get code_review_settings or nested under get repo:aicr_settings,
mirroring the existing pr:insight sub-resource pattern).

API endpoint

```
GET /gateway/aicr/api/v1/settings?repo_path={repo_path}&recursive=true
```

• repo_path — URL-encoded repo path (e.g. l7B_kbSEQD2wjrM7PShm5w/PROD/Harness_Commons/harness-core)
• recursive — when true, includes settings inherited from parent scopes (account/org/project)

Scope questions to resolve before implementing

• Should this only support get, or also update/set for changing AICR
  settings (title says "changing the setting" — need to confirm whether
  there's a corresponding PUT/PATCH endpoint for writes)?
• Where should repo_path come from — derived from the existing --repo
  identifier resolution the rest of the code module uses, or a raw flag?
• Output shape: what fields does the settings response actually contain?
  Need a sample response to design the noun's fields/columns.