sqlreplay: fix replaying with readonly mode still prepares DML statements

[djshow832]

What problem does this PR solve?

Issue Number: close #997

Problem Summary:

• Replaying with readonly mode still prepares and closes DML statements. If a readonly account is given, prepare will fail.
• Replaying with readonly mode still replays set global and select for update statements. select for update may block CDC.
• Replaying with readonly mode writes the report. It's risky if the downstream will be switched over to production.
• The checkpoint is flushed finally when replay.Close(), which is not called in the service mode.
• The report is never closed when stopping the replayer. It may start multiple times in the service mode.
• The nopReport never reads the exceptionCh, which may block the dry-run.

What is changed and how it works:
Fix all the above problems.

Check List

Tests

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

Replay TPCC in the readonly mode with a readonly account.

[2025/11/28 19:46:29.624 +08:00] [INFO] [main.replay] [replay/replay.go:955] [replay finished]  [replayed_cmds=109531] [filtered_cmds=371223] [decoded_cmds=480755] [exceptions=0] [total_wait_time=1m22.072085635s] [extra_wait_time=0s] [replay_elapsed=1m25.865426083s] [decode_elapsed=1m25.855039s] [last_cmd_start_ts=2025-09-14 19:11:18.764892584 +0800 CST] [last_cmd_end_ts=2025-09-14 19:11:18.765 +0800 CST] [duplicated={}]

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

❌ Patch coverage is 86.58537% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@a15c5e0). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pkg/util/lex/filter.go	84.61%	6 Missing ⚠️
pkg/sqlreplay/replay/replay.go	73.33%	3 Missing and 1 partial ⚠️
pkg/sqlreplay/replay/dry_run.go	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #998   +/-   ##
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  Coverage        ?   67.71%           
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  Files           ?      140           
  Lines           ?    14216           
  Branches        ?        0           
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  Hits            ?     9627           
  Misses          ?     3908           
  Partials        ?      681           

Flag	Coverage Δ
unit	67.71% <86.58%> (?)

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[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: YangKeao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-11-28 14:37:10.569508949 +0000 UTC m=+14975.383286521: ☑️ agreed by YangKeao.