feat(ai-proxy): support custom displayProviderType for self-hosted provider

[sfwn]

What this PR does / why we need it:

AI-Proxy support custom displayProviderType for self-hosted provider.

Which issue(s) this PR fixes:

• Erda Cloud Issue Link

ChangeLog

Language	Changelog
🇺🇸 English	AI-Proxy support custom displayProviderType for self-hosted provider
🇨🇳 中文	AI-Proxy 为自建供应商提供自定义类型用于展示

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.13%. Comparing base (cf722c4) to head (3331f57).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6493      +/-   ##
==========================================
- Coverage   15.13%   15.13%   -0.01%     
==========================================
  Files        3683     3683              
  Lines      377034   377034              
==========================================
- Hits        57059    57056       -3     
- Misses     314528   314530       +2     
- Partials     5447     5448       +1     

Flag	Coverage Δ
by-github-actions	15.13% <ø> (-0.01%)	⬇️

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see 4 files with indirect coverage changes