feat: add the max traffic weight support for the traffic routing (nginx/plugins).

[andyliuliming]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[github-actions]

Go Published Test Results

2 137 tests   2 137 ✅  2m 51s ⏱️
  119 suites      0 💤
    1 files        0 ❌

Results for commit a9e40dc.

♻️ This comment has been updated with latest results.

[github-actions]

E2E Tests Published Test Results

  4 files    4 suites   3h 44m 18s ⏱️
107 tests  96 ✅  6 💤  5 ❌
452 runs  403 ✅ 24 💤 25 ❌

For more details on these failures, see this check.

Results for commit a9e40dc.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 92.68293% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 82.89%. Comparing base (8405f2e) to head (a9e40dc).
Report is 31 commits behind head on master.

Files	Patch %	Lines
rollout/trafficrouting/nginx/nginx.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3215      +/-   ##
==========================================
+ Coverage   81.83%   82.89%   +1.05%     
==========================================
  Files         135      135              
  Lines       20688    16916    -3772     
==========================================
- Hits        16931    14023    -2908     
+ Misses       2883     2015     -868     
- Partials      874      878       +4     

☔ View full report in Codecov by Sentry.
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[andyliuliming]

trying to resolve
#2901
#2889
#2657

[andyliuliming]

@zachaller could you please help take a look when you have time? thanks.

[andyliuliming]

@zachaller any chance to help do a review? thanks.

[andyliuliming]

@zachaller ping :)
if this merged to master sooner, that will save us a little time to maintain a copy of the repo for this feature (both with this feature and the fixes we need from master branch).
could you please help review? thanks.

[sonarcloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
4.1% Duplication on New Code

See analysis details on SonarCloud