In #15178, we're switching hard-coded constants in tests to insta.

This issue targets updating datafusion-cli tests (datafusion-cli/).

Examples of tests that need to be switched to insta

• datafusion/datafusion-cli/src/print_format.rs

  Lines 242 to 246 in 9730404

  	let expected = &[
  	"+---+---+---+",
  	"| a | b | c |",
  	"+---+---+---+",
  	"+---+---+---+",

• datafusion/datafusion-cli/src/print_format.rs

  Lines 411 to 415 in 9730404

  	let expected = &[
  	"+---+",
  	"| a |",
  	"+---+",
  	"| 1 |",

Check the original issue for tips on how to do the switch and examples of completed PRs.