refactor: use UNSET instead of enable

[CookiePieWw]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#4952

What's changed and what's your intention?

Previously introduced alter fulltext use

ALTER TABLE monitor COLUMN <column_name> SET FULLTEXT WITH(enable='false');

to disable the fulltext index.

This patch change it to

ALTER TABLE monitor COLUMN <column_name> UNSET FULLTEXT;

for simplicity and better compatibility with fulltext index settings in CREATE stmt.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 90.10989% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.77%. Comparing base (3bf9981) to head (a84b991).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4983      +/-   ##
==========================================
- Coverage   84.05%   83.77%   -0.28%     
==========================================
  Files        1144     1144              
  Lines      213324   213480     +156     
==========================================
- Hits       179318   178853     -465     
- Misses      34006    34627     +621     

[waynexia]

Please add a brief description of this PR

[CookiePieWw]

Please add a brief description of this PR

Updated. Thanks for reminding.

[fengjiachun]

LGTM