#10919 fix(mock-service): mock own object properties

[satanTime]

Closes #10919

Summary

• mock zero-argument classes from a real instance first so own object properties are preserved
• fall back to prototype-only mocking when instantiation is not safe
• add root and MockService regression coverage for nested object methods

Validation

• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh root
• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh coverage
• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh e2e
• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh a5es5
• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh a14
• COMPOSE_PROJECT_NAME=ngmocks_i10919_1145 sh test.sh a20

Coverage

• libs/ng-mocks/src/lib/mock-service/mock-service.ts: LF/LH 40/40, BRF/BRH 29/29

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (08fa9e6) to head (1835cca).

Additional details and impacted files

@@            Coverage Diff            @@
##              main    #13376   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          228       229    +1     
  Lines         4168      4219   +51     
  Branches      1187      1198   +11     
=========================================
+ Hits          4168      4219   +51     

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