e2e(engine): test two running DM jobs

[lance6716]

What problem does this PR solve?

Issue Number: ref #5504

What is changed and how it works?

add test of two running jobs, so we can test about metrics later

Check List

Tests

• No code

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• GMHDBJD

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[GMHDBJD]

LGTM

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: f3181ba

[lance6716]

/run-verify

[codecov-commenter]

Codecov Report

Merging #5581 (f3181ba) into master (fcea4d5) will increase coverage by 0.2900%.
The diff coverage is 61.4636%.

Flag	Coverage Δ
cdc	61.5427% <61.5661%> (+0.3946%)	⬆️
dm	52.0205% <61.2852%> (-0.0222%)	⬇️

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

@@               Coverage Diff                @@
##             master      #5581        +/-   ##
================================================
+ Coverage   56.0768%   56.3669%   +0.2900%     
================================================
  Files           535        674       +139     
  Lines         70143      78468      +8325     
================================================
+ Hits          39334      44230      +4896     
- Misses        27078      30085      +3007     
- Partials       3731       4153       +422