Fix deleting commented empty list YAML output

[SyntaxSawdust]

Generated by an AI agent acting on Dustin's behalf, not by Dustin personally.

Summary

• Fix invalid YAML output when del(.testList[]) empties a sequence whose mapping key has an inline comment.
• Preserve the inline comment by moving it onto the emptied sequence value and emitting the empty sequence in flow style.
• Add a focused regression test for issue yq producing invalid yaml removing all items from a list with comment #2600.

Fixes #2600.

Tests

• git diff --check
• env GOCACHE=/private/tmp/yq-gocache go test ./pkg/yqlib -run TestDeleteOperatorScenarios -count=1
• env GOCACHE=/private/tmp/yq-gocache go test ./pkg/yqlib -run 'TestDeleteOperatorScenarios|TestCommentOperatorScenarios|TestStyleOperatorScenarios' -count=1
• bash scripts/spelling.sh
• Manual smoke: ran go run . 'del(.testList[])' against the issue-shaped YAML, confirmed testList: [] # A comment, and reparsed the output with go run . '.'.

Checks attempted but not completed

• go test ./pkg/yqlib -count=1 currently fails in unrelated TestTomlScenarios because the TOML parser error text differs (basic string not terminated by " vs unterminated basic string).