feat: add evaluation_mode field to YAML custom policy attribute checks

[nijdarshan]

Summary

• Adds evaluation_mode field to YAML custom policy attribute checks
• Supports any mode: check passes if at least one resource of the specified type matches the condition
• Default behavior (all) is preserved - backward compatible
• Fixes Custom YAML check for Dockerfile #7389

Problem

When creating a custom YAML check for Dockerfiles that checks for a specific RUN command, the check evaluates each RUN instruction independently. If a Dockerfile has multiple RUN instructions, the check passes for matching instructions but fails for non-matching ones - even if the intent is "at least one RUN must contain this command."

Solution

Add an optional evaluation_mode field to attribute check definitions:

metadata:
  id: "DOCKERFILE_1"
  name: "Ensure apt-get update exists"
  category: "APPLICATION_SECURITY"
definition:
  cond_type: attribute
  resource_types:
    - RUN
  attribute: value
  operator: contains
  value: "apt-get update"
  evaluation_mode: any  # NEW: passes if at least one RUN matches

Values

• all (default): All matching resources must pass the condition (current behavior)
• any: At least one matching resource must pass the condition

Implementation

• BaseGraphCheck gets a new evaluation_mode field (default: "all")
• GraphCheckParser parses and validates the field from YAML
• BaseRegistry.run_check_parallel() applies per-file aggregation when mode is "any"
  • If any resource in a file passes, all resources of that type in the file pass
  • If no resource passes, one representative failure per file is reported

Test plan

• Unit tests for evaluation_mode: any (pass when at least one matches)
• Unit tests for evaluation_mode: any (fail when none match)
• Unit tests confirming default mode behavior is unchanged
• Tests run on both NETWORKX and RUSTWORKX graph frameworks
• Existing Dockerfile tests pass
• Existing checks_infra parser tests pass
• CLI verification with real Dockerfiles

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