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

This issue targets updating physical plan tests (datafusion/physical-plan).

Examples of tests that need to be switched to insta

• datafusion/datafusion/physical-plan/src/aggregates/topk/priority_map.rs

  Lines 133 to 137 in 0e77fb2

  	+----------+--------------+
  	| trace_id | timestamp_ms |
  	+----------+--------------+
  	| 1 | 1 |
  	+----------+--------------+

• datafusion/datafusion/physical-plan/src/unnest.rs

  Lines 1149 to 1159 in 0e77fb2

  	"+---------------------------------+---------------------------------+---------------------------------+",
  	"| col1_unnest_placeholder_depth_1 | col1_unnest_placeholder_depth_2 | col2_unnest_placeholder_depth_1 |",
  	"+---------------------------------+---------------------------------+---------------------------------+",
  	"| [1, 2, 3] | 1 | a |",
  	"| | 2 | b |",
  	"| [4, 5] | 3 | |",
  	"| [1, 2, 3] | | a |",
  	"| | | b |",
  	"| [4, 5] | | |",
  	"| [1, 2, 3] | 4 | a |",
  	"| | 5 | b |",

• datafusion/datafusion/physical-plan/src/aggregates/topk/heap.rs

  Lines 536 to 539 in 0e77fb2

  	val=3 idx=0, bucket=3
  	├── val=1 idx=1, bucket=1
  	└── val=2 idx=2, bucket=2
  	"#;

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