Flaky test TestTetchAllSchemasWithTablesWithFailpoint

[bb7133]

Bug Report

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1. Minimal reproduce step (Required)

Found in release-8.4 branch(https://do.pingcap.net/jenkins/blue/rest/organizations/jenkins/pipelines/pingcap/pipelines/tidb/pipelines/release-8.4/pipelines/pull_unit_test/runs/34/nodes/63/steps/69/log/?start=0):

[2024/10/25 16:44:40.960 +00:00] [ERROR] [domain.go:1095] ["reload schema in loop failed"] [error="failpoint: failed to fetch schemas with tables"] [errorVerbose="failpoint: failed to fetch schemas with tables\ngithub.com/pingcap/tidb/pkg/domain.(*Domain).fetchSchemasWithTables\n\tpkg/domain/domain.go:507\ngithub.com/pingcap/tidb/pkg/domain.(*Domain).fetchAllSchemasWithTables.func1\n\tpkg/domain/domain.go:471\ngithub.com/pingcap/tidb/pkg/util.(*ErrorGroupWithRecover).Go.func1\n\tpkg/util/wait_group_wrapper.go:250\ngolang.org/x/sync/errgroup.(*Group).Go.func1\n\texternal/org_golang_x_sync/errgroup/errgroup.go:78\nruntime.goexit\n\tsrc/runtime/asm_amd64.s:1700"] [stack="github.com/pingcap/tidb/pkg/domain.(*Domain).loadSchemaInLoop\n\tpkg/domain/domain.go:1095\ngithub.com/pingcap/tidb/pkg/domain.(*Domain).Start.func2\n\tpkg/domain/domain.go:1490\ngithub.com/pingcap/tidb/pkg/util.(*WaitGroupEnhancedWrapper).Run.func1\n\tpkg/util/wait_group_wrapper.go:99"]
    db_test.go:202: 
        	Error Trace:	pkg/domain/db_test.go:202
        	Error:      	An error is expected but got nil.
        	Test:       	TestTetchAllSchemasWithTablesWithFailpoint

I'm not sure if master has this, too.

And there's a typo in TestTetchAllSchemasWithTablesWithFailpoint, which should be fixed, too.

[bb7133]

PTAL @joccau

[joccau]

/remove-label may-affects-5.4
/remove-label may-affects-6.1
/remove-label may-affects-6.5
/remove-label may-affects-7.1
/remove-label may-affects-7.5
/remove-label may-affects-8.1