Fix: Remove dingtalk temporary and fix problem in before_ut.bat

[zouyx]

What this PR does:

• Remove dingtalk temporary
• Fix problem in before_ut.bat
• Add contribute.md into pull request template
• Doc directory cause go get fail in github action, then delete doc directory.

https://github.com/apache/dubbo-go/pull/786/checks?sha=eb098d009e10015035cf6b1600dc4a9c977a3da1

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov-io]

Codecov Report

Merging #786 into develop will increase coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #786      +/-   ##
===========================================
+ Coverage    59.80%   59.91%   +0.11%     
===========================================
  Files          259      259              
  Lines        12737    12737              
===========================================
+ Hits          7617     7632      +15     
+ Misses        4166     4152      -14     
+ Partials       954      953       -1     

Impacted Files	Coverage Δ
cluster/router/chain/chain.go	59.34% <0.00%> (-4.07%)	⬇️
remoting/kubernetes/listener.go	50.52% <0.00%> (ø)
remoting/kubernetes/watch.go	79.34% <0.00%> (+2.17%)	⬆️
cluster/cluster_impl/failback_cluster_invoker.go	78.31% <0.00%> (+2.40%)	⬆️
remoting/kubernetes/client.go	75.75% <0.00%> (+3.03%)	⬆️
...tocol/rest/server/server_impl/go_restful_server.go	51.16% <0.00%> (+4.65%)	⬆️
metadata/report/delegate/delegate_report.go	39.83% <0.00%> (+10.16%)	⬆️

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[williamfeng323]

lgtm