WA-OPS-653: Fix existing Rubocop offenses on next

[kitcommerce]

Summary

Fix 4 existing, autocorrectable Rubocop offenses currently present on next.

Why

The dispatcher build gate runs bundle exec rubocop; since next is currently failing, every PR fails the build gate with the same 4 offenses. This PR makes next Rubocop-clean to unblock review.

Changes

• Rakefile: spacing around <<
• core/lib/workarea/configuration.rb: comment indentation
• core/lib/workarea/ext/freedom_patches/bson_document.rb: remove trailing whitespace
• core/test/lib/workarea/elasticsearch/document_test.rb: remove trailing whitespace

Verification

• bundle exec rubocop (clean)

Client impact

None expected (formatting-only).

[kitcommerce]

Dispatcher build gate (local)

• rubocop: PASS (0 offenses)

Note: repo bundle currently does not include / executables in this environment, so only rubocop was run for this unblocker PR.