dotnet-svcutil: write generated json file with relative path for referenced assembly.

[imcarolwang]

For issue #5495.

Write referenced assembly name instead of absolute path to the generated parameters json file, corresponding to the change, recalculate references base on project dependencies for update operation, update related test as well.

[voroninp]

Any estimations for the merge? ;-)

[imcarolwang]

/azp run

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