tiproxy: revert enable SSL by default

[xhebox]

What problem does this PR solve?

What is changed and how does it work?

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.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-20 11:33:34.837939436 +0000 UTC m=+102580.239189886: ☑️ agreed by csuzhangxc.

[xhebox]

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[codecov-commenter]

Codecov Report

Merging #5084 (647461d) into master (0015c82) will increase coverage by 7.62%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5084      +/-   ##
==========================================
+ Coverage   57.42%   65.05%   +7.62%     
==========================================
  Files         246      250       +4     
  Lines       28585    31956    +3371     
==========================================
+ Hits        16415    20788    +4373     
+ Misses      10577     9511    -1066     
- Partials     1593     1657      +64     

Flag	Coverage Δ
e2e	47.62% <0.00%> (?)
unittest	57.43% <0.00%> (+0.01%)	⬆️

[xhebox]

/test pull-e2e-kind-across-kubernetes
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@xhebox: The label(s) /pull-e2e-kind-across-kubernetes, /pull-e2e-kind-basic cannot be applied, because the repository doesn't have them.

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@xhebox: No presubmit jobs available for pingcap/tidb-operator@master

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