fix: use fe_opts after setup_frontend_plugins in standalone

[shuiyisong]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Use fe_opts processed by setup_frontend_plugins instead of original MixOptions::FrontendOptions

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

[sunng87]

Is it possible to take ownership of opts in setup_frontend_plugins? so there is no chance to reuse opts afterwards.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (e89f5dc) 85.63% compared to head (b779196) 85.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3275      +/-   ##
==========================================
- Coverage   85.63%   85.23%   -0.40%     
==========================================
  Files         859      859              
  Lines      140796   140796              
==========================================
- Hits       120564   120005     -559     
- Misses      20232    20791     +559     

[shuiyisong]

Is it possible to take ownership of opts in setup_frontend_plugins? so there is no chance to reuse opts afterwards.

we can move the ownership of FrontendOptions out of MixOptions so that opts.frontend is no longer usable

[killme2008]

LGTM