Fix: xds enhancement

[LaurenceLiZhixin]

What this PR does:

1. Triple header 增加环境标：environment: xxx
2. 删除掉注册在 istiod 的接口元数据中“group”和 “version”，这两个字段在xds 场景获取接口映射时无意义。

Which issue(s) this PR fixes:
Fixes #

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• All ut passed (run 'go test ./...' in project root)
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• After import formatted, (using imports-formatter to run 'imports-formatter .' in project root, to format your import blocks, mentioned in CONTRIBUTING.md above)
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• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[codecov-commenter]

Codecov Report

Merging #1853 (dde8baa) into 3.0 (ae8893a) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.0    #1853      +/-   ##
==========================================
- Coverage   46.83%   46.78%   -0.05%     
==========================================
  Files         295      295              
  Lines       17172    17173       +1     
==========================================
- Hits         8042     8035       -7     
- Misses       8275     8285      +10     
+ Partials      855      853       -2     

Impacted Files	Coverage Δ
common/proxy/proxy_factory/default.go	21.53% <100.00%> (+1.22%)	⬆️
cluster/cluster/base/cluster_invoker.go	24.44% <0.00%> (-13.34%)	⬇️
remoting/xds/client.go	56.00% <0.00%> (-0.89%)	⬇️
metrics/prometheus/reporter.go	28.57% <0.00%> (+1.71%)	⬆️
registry/nacos/listener.go	80.86% <0.00%> (+2.60%)	⬆️

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