Remove deprecated flags

[dveeden]

What problem does this PR solve?

Problem Summary:

What is changed and how it works:

This was deprecated on Fri Apr 12 10:00:22 2024 +0800 by #504

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

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None

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@d3f8304). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
cmd/tiproxy/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #854   +/-   ##
=======================================
  Coverage        ?   67.23%           
=======================================
  Files           ?      129           
  Lines           ?    12260           
  Branches        ?        0           
=======================================
  Hits            ?     8243           
  Misses          ?     3435           
  Partials        ?      582           

Flag	Coverage Δ
unit	67.23% <0.00%> (?)

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[djshow832]

I'll hold this PR because it breaks compatibility. Some tools may have added these options. It makes them unable to start without removing the options.

[dveeden]

/hold

[dveeden]

Do we now which tools might use these? TiUP Cluster? TiUP Playground? TiDB Operator? Maybe we should try go get those fixed as the options currently don't do anything.

Should we add some warnings/errors on stderr if anyone calls tiproxy with the deprecated (noop) options?