Extend Mcp/UseGraphqlQueryFile to cover ee/app/services/mcp/tools

What does this MR do and why?

Adds ee/app/services/mcp/tools/**/* to the Include list of the Mcp/UseGraphqlQueryFile RuboCop cop in .rubocop.yml.

The cop was scoped to app/services/mcp/tools/**/* and ee/app/services/ee/mcp/tools/**/*, but real EE MCP tool services also live under ee/app/services/mcp/tools/ (e.g. ee/app/services/mcp/tools/security/attach_scan_profile_service.rb). The missing glob meant the cop never linted those files, leaving a coverage gap for inline GraphQL operations.

This is a configuration-only change; the cop implementation is unchanged.

Verification:

• bundle exec rubocop --only Mcp/UseGraphqlQueryFile ee/app/services/mcp/tools → 15 files inspected, no offenses detected (all existing tools already use load_graphql).
• bundle exec rubocop --only Mcp/UseGraphqlQueryFile app/services/mcp/tools ee/app/services/mcp/tools ee/app/services/ee/mcp/tools → 122 files inspected, no offenses detected.
• bundle exec rspec spec/rubocop/cop/mcp/use_graphql_query_file_spec.rb → 7 examples, 0 failures.

References

• Closes #630184 (closed)
• Related: !255760 (adds the sibling Mcp/VersionedMethodNaming cop, which already covers all three paths)

Screenshots or screen recordings

Not applicable: linting configuration change only.

How to set up and validate locally

1. Run the cop against the newly covered directory:

   bundle exec rubocop --only Mcp/UseGraphqlQueryFile ee/app/services/mcp/tools

2. Confirm the cop's effective config now includes the new path:

   bundle exec rubocop --show-cops Mcp/UseGraphqlQueryFile

3. Introduce an inline graphql_operation: string in a file under ee/app/services/mcp/tools/ and confirm the cop flags it (revert afterwards).

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