Fix(e2e): run a mysql client in kind to test graceful shutdown case

[fgksgf]

What problem does this PR solve?

The e2e case should be able to gracefully shutdown tidb is not stable, because we use port-forward to connect to tidb.

According to kubectl port-forward doc:

If there are multiple pods matching the criteria, a pod will be selected automatically. The forwarding session ends when the selected pod terminates, and a rerun of the command is needed to resume forwarding.

https://kubernetes.io/docs/reference/kubectl/generated/kubectl_port-forward/#synopsis

What is changed and how does it work?

This PR adds a binary and deploy it to KinD to test the graceful shutdown case. The binary acts as a mysql client, it connects to the tidb cluster via k8s service's cluster IP.

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.14%. Comparing base (3a93897) to head (6f60ab1).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature/v2    #6005   +/-   ##
===========================================
  Coverage       21.14%   21.14%           
===========================================
  Files             152      152           
  Lines           10379    10379           
===========================================
  Hits             2195     2195           
  Misses           7972     7972           
  Partials          212      212           

Flag	Coverage Δ
unittest	21.14% <ø> (ø)

[csuzhangxc]

/run-pull-e2e-kind-v2

[fgksgf]

/run-pull-e2e-kind-v2

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This pull-request has been approved by: csuzhangxc

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