sqlreplay, backend: fix bugs to make traffic replay runnable

[djshow832]

What problem does this PR solve?

Issue Number: ref #642

Problem Summary:
There are some bugs when I manually test traffic capture and replay.

What is changed and how it works:

• Fix some bugs to make it runnable
• Refine logs for troubleshoot

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Notable changes

• Has configuration change
• Has HTTP API interfaces change
• Has tiproxyctl change
• Other user behavior changes

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.86885% with 27 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@7a4a4c2). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pkg/sqlreplay/manager/manager.go	74.07%	6 Missing and 1 partial ⚠️
pkg/sqlreplay/replay/handshake_handler.go	40.00%	6 Missing ⚠️
pkg/sqlreplay/cmd/cmd.go	64.28%	5 Missing ⚠️
pkg/sqlreplay/replay/replay.go	87.09%	4 Missing ⚠️
pkg/sqlreplay/capture/capture.go	88.88%	2 Missing and 1 partial ⚠️
pkg/proxy/net/packetio.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #671   +/-   ##
=======================================
  Coverage        ?   69.78%           
=======================================
  Files           ?       99           
  Lines           ?     9419           
  Branches        ?        0           
=======================================
  Hits            ?     6573           
  Misses          ?     2370           
  Partials        ?      476           

Flag	Coverage Δ
unit	69.78% <77.86%> (?)

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xhebox

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• OWNERS [xhebox]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-13 10:23:28.883694262 +0000 UTC m=+611078.624118201: ☑️ agreed by xhebox.