Use ProtocolUtils.isGeneric judge generic type

[finefuture]

What is the purpose of the change

Only judge true isn't accurate

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

66.7% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #12876 (c0fcf15) into 3.2 (45405ff) will increase coverage by 0.73%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##                3.2   #12876       +/-   ##
=============================================
+ Coverage     68.77%   69.50%    +0.73%     
+ Complexity      318        2      -316     
=============================================
  Files          3657     1648     -2009     
  Lines        170962    68371   -102591     
  Branches      28310     9989    -18321     
=============================================
- Hits         117573    47520    -70053     
+ Misses        43258    16274    -26984     
+ Partials      10131     4577     -5554     

see 2043 files with indirect coverage changes

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