ebs-warmup: added test cases && better exit logic (#5272)

[ti-chi-bot]

This is an automated cherry-pick of #5272

What problem does this PR solve?

The warmup binary hasn't been tested enough yet. And it may not be properly exited once SIGINT received.

What is changed and how does it work?

This PR make the procedure of sending requests abortable, and added some unit tests for this binary.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

NONE

[codecov-commenter]

Codecov Report

Merging #5290 (1d153d2) into release-1.5 (d5d4b38) will increase coverage by 7.42%.
The diff coverage is 76.19%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5290      +/-   ##
===============================================
+ Coverage        57.53%   64.96%   +7.42%     
===============================================
  Files              251      258       +7     
  Lines            30210    34082    +3872     
===============================================
+ Hits             17382    22140    +4758     
+ Misses           11122    10174     -948     
- Partials          1706     1768      +62     

Flag	Coverage Δ
e2e	48.55% <ø> (?)
unittest	57.60% <76.19%> (+0.07%)	⬆️

[BornChanger]

/retest

[BornChanger]

/test pull-e2e-kind-tikv-scale-simultaneously

[ti-chi-bot]

@BornChanger: The label(s) /pull-e2e-kind-tikv-scale-simultaneously cannot be applied, because the repository doesn't have them.

In response to this:

/test pull-e2e-kind-tikv-scale-simultaneously

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[ti-chi-bot]

@BornChanger: No presubmit jobs available for pingcap/tidb-operator@release-1.5

In response to this:

/test pull-e2e-kind-tikv-scale-simultaneously

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-16 03:32:14.060019963 +0000 UTC m=+315500.027607998: ☑️ agreed by BornChanger.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, WangLe1321

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