sink(ticdc): remove duplicate sort about open protocol

[wk989898]

What problem does this PR solve?

Issue Number: ref #10913

What is changed and how it works?

Repeat with the following code

tiflow/pkg/sink/codec/open/open_protocol_message.go

Lines 229 to 231 in 45c831a

	sort.Slice(sinkCols, func(i, j int) bool {
	return strings.Compare(sinkCols[i].Name, sinkCols[j].Name) > 0
	})

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

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

Release note

`None`.

[ti-chi-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.4835%. Comparing base (45c831a) to head (e94694f).

Additional details and impacted files

Components	Coverage Δ
cdc	61.2521% <ø> (+0.0200%)	⬆️
dm	51.0213% <ø> (-0.0122%)	⬇️
engine	63.4091% <ø> (+0.0141%)	⬆️

Flag	Coverage Δ
unit	57.4835% <ø> (+0.0063%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master     #11601        +/-   ##
================================================
+ Coverage   57.4771%   57.4835%   +0.0063%     
================================================
  Files           851        851                
  Lines        126539     126525        -14     
================================================
  Hits          72731      72731                
+ Misses        48407      48396        -11     
+ Partials       5401       5398         -3     

[wk989898]

/cc @3AceShowHand @CharlesCheung96 @asddongmen