Remove empty model_type parameter in anomaly detector suggestion agent template

[gaobinlong]

Description

There's an empty model_type parameter existing in the anomaly detector suggestion agent template, which is unused and may introduce confusion, need to remove it.

Related Issues

No issue.

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.57%. Comparing base (35b171e) to head (d8d58d0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #959   +/-   ##
=========================================
  Coverage     77.57%   77.57%           
  Complexity      993      993           
=========================================
  Files            99       99           
  Lines          4714     4714           
  Branches        431      431           
=========================================
  Hits           3657     3657           
  Misses          877      877           
  Partials        180      180           

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[yuye-aws]

LGTM