TestBundle is flaky

[rleungx]

Flaky Test

Which jobs are failing

 --- FAIL: TestRuleTestSuite (17.00s)
2024-03-14T08:12:31.6734504Z     testutil.go:276: start test TestBatch in pd mode
2024-03-14T08:12:31.6734727Z     testutil.go:306: start test TestBatch in api mode
2024-03-14T08:12:31.6734942Z     testutil.go:276: start test TestBundle in pd mode
2024-03-14T08:12:31.6735164Z     testutil.go:306: start test TestBundle in api mode
2024-03-14T08:12:31.6735409Z     --- FAIL: TestRuleTestSuite/TestBundle (2.02s)
2024-03-14T08:12:31.6735572Z         rule_test.go:823: 
2024-03-14T08:12:31.6736077Z             	Error Trace:	/home/runner/work/pd/pd/tests/server/api/rule_test.go:823
2024-03-14T08:12:31.6736628Z             	            				/home/runner/work/pd/pd/tests/testutil.go:310
2024-03-14T08:12:31.6737172Z             	            				/home/runner/work/pd/pd/tests/testutil.go:271
2024-03-14T08:12:31.6737827Z             	            				/home/runner/work/pd/pd/tests/server/api/rule_test.go:762
2024-03-14T08:12:31.6740304Z             	Error:      	"[{"group_id":"pd","group_index":0,"group_override":false,"rules":[{"group_id":"pd","id":"default","start_key":"","end_key":"","role":"voter","is_witness":false,"count":3}]} {"group_id":"foo","group_index":42,"group_override":true,"rules":[{"group_id":"foo","id":"bar","index":1,"override":true,"start_key":"","end_key":"","role":"voter","is_witness":false,"count":1,"create_timestamp":1710403851}]}]" should have 1 item(s), but has 2
2024-03-14T08:12:31.6740653Z             	Test:       	TestRuleTestSuite/TestBundle

CI link

https://github.com/tikv/pd/actions/runs/8277329057/job/22647490824?pr=7918

Reason for failure (if possible)

Anything else