Rename getModelEnvironment to modelEnvironment

[AlbumenJ]

What is the purpose of the change

Fix #12542
Fix #12121
Fix #11785

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.
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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
11 Code Smells

25.8% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #12551 (4276aa4) into 3.2 (467622a) will decrease coverage by 0.22%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #12551      +/-   ##
============================================
- Coverage     69.44%   69.22%   -0.22%     
+ Complexity      338        2     -336     
============================================
  Files          3496     1637    -1859     
  Lines        165133    67525   -97608     
  Branches      27752     9907   -17845     
============================================
- Hits         114674    46745   -67929     
+ Misses        40423    16257   -24166     
+ Partials      10036     4523    -5513     

see 1880 files with indirect coverage changes

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