add dubbo3.x router workflow

[chengyouling]

What type of PR is this?

dubbo3.x plugin test workflow.

What this PR does / why we need it?

In order to run dubbo3.x test action.

Which issue(s) this PR fixes?

#1452

Does this PR introduce a user-facing change?

No

[codecov]

Codecov Report

Attention: Patch coverage is 27.77778% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 43.38%. Comparing base (90b58da) to head (f7ee44d).
Report is 5 commits behind head on develop.

Files	Patch %	Lines
...ubbo/interceptor/AbstractDirectoryInterceptor.java	0.00%	2 Missing ⚠️
...oud/sermant/router/common/config/RouterConfig.java	50.00%	2 Missing ⚠️
...uter/dubbo/declarer/AbstractDirectoryDeclarer.java	0.00%	1 Missing ⚠️
...t/router/config/handler/AbstractConfigHandler.java	50.00%	0 Missing and 1 partial ⚠️
...ant/router/config/handler/GlobalConfigHandler.java	0.00%	0 Missing and 1 partial ⚠️
...ant/router/config/handler/RouterConfigHandler.java	0.00%	0 Missing and 1 partial ⚠️
...nt/router/config/handler/ServiceConfigHandler.java	0.00%	0 Missing and 1 partial ⚠️
...nt/router/config/handler/kind/FlowKindHandler.java	0.00%	0 Missing and 1 partial ⚠️
...nt/router/config/handler/kind/LaneKindHandler.java	0.00%	0 Missing and 1 partial ⚠️
...ant/router/config/handler/kind/TagKindHandler.java	0.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1476      +/-   ##
=============================================
- Coverage      43.39%   43.38%   -0.02%     
  Complexity      4647     4647              
=============================================
  Files           1234     1234              
  Lines          26391    26398       +7     
  Branches        2755     2755              
=============================================
  Hits           11453    11453              
- Misses         13560    13566       +6     
- Partials        1378     1379       +1     

Flag	Coverage Δ
unittests	43.38% <27.77%> (-0.02%)	⬇️

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