Add %j (JSON) format specifier support in debugger console - #2379

PR classified as team-member.

⚠️ Head commit is NOT signed by a trusted team member, so the full 2-approval requirement applies. (Head commit is signed by GitHub but is not a 2-parent merge (has 1 parent(s)); not eligible for the Update-branch credit.)

Tip: signing the head commit with a key listed in security/trusted-signing-keys.csv reduces the approval requirement by 1.

⚠️ Collaborator approvals: 0/2.

Needs 2 more collaborator approvals to merge.