chore: use spaces for JSON indent in plot graph defaults #24840

Job	Run time
Auto-fix lint errors	-1s
Rebase this PR on top of develop branch	-1s
Merge changes from develop branch into this PR	-1s
Remove in-progress label	0s
Check for required files	-8s
Manage labels	-8s
Update copyright header years	-10s
	-29s

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