feat: user can skip upstream when select service_id

[LiteSun]

Please answer these questions before submitting a pull request

• Why submit this pull request?

• Bugfix

• New feature provided

• Improve performance

• Backport patches

• Related issues
  resolve The process of creating routes using dashboard needs improvement #1213, resolve bug(fe): route created with service can not use the service upstream #1278

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New feature or improvement

• Describe the details and related test reports.
  user can skip upstream when select service_id.

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Please add the corresponding test cases if necessary.

• Todo

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[liuxiran]

just to make sure that this pr could also solves #1278 , if so I will move to other issues, thanks ^-^

cc @LiteSun @juzhiyuan

[LiteSun]

just to make sure that this pr could also solves #1278 , if so I will move to other issues, thanks ^-^

cc @LiteSun @juzhiyuan

According to the issue(#1278) description, this PR will resolve the issue. 😄

[codecov-io]

Codecov Report

Merging #1302 (909fc2f) into master (749eeb5) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1302      +/-   ##
==========================================
+ Coverage   44.36%   44.47%   +0.11%     
==========================================
  Files          31       32       +1     
  Lines        1961     1965       +4     
==========================================
+ Hits          870      874       +4     
- Misses        979      980       +1     
+ Partials      112      111       -1     

Impacted Files	Coverage Δ
api/cmd/manager/main.go	0.00% <0.00%> (ø)
api/internal/core/store/store.go	81.48% <0.00%> (+1.48%)	⬆️

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[LiteSun]

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