dmctl: fix error and add test for binlog-schema delete (#8180)

[ti-chi-bot]

This is an automated cherry-pick of #8180

What problem does this PR solve?

Issue Number: close #7373

What is changed and how it works?

Use SchemaOp_RemoveSchema in newSourceTableSchemaDeleteCmd.

Check List

Tests

• Integration test

Questions

Will it cause performance regression or break compatibility?

No

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

No

Release note

None

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.1@992ae65). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 39a1f2a differs from pull request most recent head 99a3298. Consider uploading reports for the commit 99a3298 to get more accurate results

Additional details and impacted files

Flag	Coverage Δ
cdc	67.4829% <0.0000%> (?)
dm	57.9106% <0.0000%> (?)
engine	66.5908% <0.0000%> (?)

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

@@               Coverage Diff                @@
##             release-6.1      #8207   +/-   ##
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  Coverage               ?   63.0418%           
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  Files                  ?       1021           
  Lines                  ?     147334           
  Branches               ?          0           
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  Hits                   ?      92882           
  Misses                 ?      47319           
  Partials               ?       7133           

[lance6716]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9cbe564

[ti-chi-bot]

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