fix Grayscale release Item Value length limit can not be synchronized…

[David-zhang-beep]

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fix Grayscale release Item Value length limit can not be synchronized with its main version

What's the purpose of this PR

upgrade the capacity of gray release

Which issue(s) this PR fixes:

Fixes #

Brief changelog

update ItemService.checkItemValueLength() method with logic of find parentNamespace's info.
recheck

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[codecov]

Codecov Report

Merging #4622 (6aa7754) into master (3c6baa4) will increase coverage by 0.01%.
The diff coverage is 15.38%.

❗ Current head 6aa7754 differs from pull request most recent head 38f3737. Consider uploading reports for the commit 38f3737 to get more accurate results

@@             Coverage Diff              @@
##             master    #4622      +/-   ##
============================================
+ Coverage     47.20%   47.21%   +0.01%     
- Complexity     1650     1652       +2     
============================================
  Files           347      347              
  Lines         10631    10644      +13     
  Branches       1053     1057       +4     
============================================
+ Hits           5018     5026       +8     
- Misses         5310     5315       +5     
  Partials        303      303              

Impacted Files	Coverage Δ
...trip/framework/apollo/biz/service/ItemService.java	34.95% <15.38%> (-2.83%)	⬇️
...framework/apollo/biz/service/NamespaceService.java	64.24% <0.00%> (+0.55%)	⬆️
...mework/apollo/portal/component/PortalSettings.java	65.62% <0.00%> (+7.81%)	⬆️

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[David-zhang-beep]

recheck

[David-zhang-beep]

I have read the CLA Document and I hereby sign the CLA

[nobodyiam]

LGTM