syncer(dm): Ignore SET statement for MariaDB (#10207)

[ti-chi-bot]

This is an automated cherry-pick of #10207

Without this the following happens:

[2023/11/29 11:17:55.229 +02:00]
[DPANIC]
[tracker.go:206]
["unexpected statement type"]
[task=demo-mariadb-tidb]
[unit="binlog replication"]
[component=schema-tracker]
[task=demo-mariadb-tidb]
[type=*ast.SetStmt]
[stack="github.com/pingcap/tiflow/dm/pkg/schema.(*Tracker).Exec\n\tgithub.com/pingcap/tiflow/dm/pkg/schema/tracker.go:206\ngithub.com/pingcap/tiflow/dm/syncer.(*Syncer).loadTableStructureFromDump\n\tgithub.com/pingcap/tiflow/dm/syncer/syncer.go:3068\ngithub.com/pingcap/tiflow/dm/syncer.(*Syncer).Run\n\tgithub.com/pingcap/tiflow/dm/syncer/syncer.go:1856\ngithub.com/pingcap/tiflow/dm/syncer.(*Syncer).Process\n\tgithub.com/pingcap/tiflow/dm/syncer/syncer.go:757"]

[2023/11/29 11:17:55.231 +02:00]
[INFO]
[syncer.go:1688]
["received ungraceful exit ctx, exit now"]
[task=demo-mariadb-tidb]
[unit="binlog replication"]
panic: interface conversion: ast.StmtNode is *ast.SetStmt, not *ast.CreateTableStmt

goroutine 1807 [running]:
github.com/pingcap/tiflow/dm/syncer.(*Syncer).loadTableStructureFromDump(0xc000cb7200, {0x4a54438, 0xc00105dd10})
	github.com/pingcap/tiflow/dm/syncer/syncer.go:3079 +0x1ce9
github.com/pingcap/tiflow/dm/syncer.(*Syncer).Run(0xc000cb7200, {0x4a54438?, 0xc00105dd10?})
	github.com/pingcap/tiflow/dm/syncer/syncer.go:1856 +0xcd6
github.com/pingcap/tiflow/dm/syncer.(*Syncer).Process(0xc000cb7200, {0x4a54438, 0xc00105dcc0}, 0x0?)
	github.com/pingcap/tiflow/dm/syncer/syncer.go:757 +0x325
created by github.com/pingcap/tiflow/dm/worker.(*SubTask).run in goroutine 1707
	github.com/pingcap/tiflow/dm/worker/subtask.go:242 +0x53b

What problem does this PR solve?

Issue Number: close #10206

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

Compatibility with MariaDB has been improved.

[ti-chi-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@7cdc3a1). Learn more about missing BASE report.

Additional details and impacted files

Components	Coverage Δ
cdc	61.7497% <0.0000%> (?)
dm	51.2360% <0.0000%> (?)
engine	63.4161% <0.0000%> (?)

Flag	Coverage Δ
unit	57.4473% <0.0000%> (?)

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@@               Coverage Diff                @@
##             release-8.1     #11440   +/-   ##
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  Files                  ?        852           
  Lines                  ?     125729           
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  Hits                   ?      72228           
  Misses                 ?      48091           
  Partials               ?       5410           

[dveeden]

/retest

[lance6716]

/retest

[lance6716]

/retest

[lance6716]

/retest