main: make sure the Welcome TiProxy info is always printed.

[yorkhellen]

What problem does this PR solve?

Issue Number: close #506

Problem Summary:

What is changed and how it works:
update the log level to "info" before print TiProxy info to make sure the info log is always printed.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code
  step 1 set the log level to "error" in config file, such as :

[log]
level = "error"

set 2 start the TiProxy and check the TiProxy info is printed.

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

[ti-chi-bot]

Welcome @yorkhellen! It looks like this is your first PR to pingcap/tiproxy 🎉

[ti-chi-bot]

Hi @yorkhellen. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-13 03:57:00.458352976 +0000 UTC m=+51239.569399424: ☑️ agreed by xhebox.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@c51070d). Click here to learn what that means.

Files	Patch %	Lines
pkg/manager/logger/manager.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #507   +/-   ##
=======================================
  Coverage        ?   64.80%           
=======================================
  Files           ?       65           
  Lines           ?     6037           
  Branches        ?        0           
=======================================
  Hits            ?     3912           
  Misses          ?     1821           
  Partials        ?      304           

Flag	Coverage Δ
unit	64.80% <0.00%> (?)

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