#7937 fix: allow TestBed.inject overrides for mocked declarations

[satanTime]

Closes #7937

Summary

• track explicit TestBed.inject/get calls for mocked declarations
• replay seeded descriptor overrides onto later declaration-local mock instances
• add regression coverage for pipes, directives, and components plus internal helpers/overrides

Validation

• COMPOSE_PROJECT_NAME=ngmocks_7937 sh ./test.sh root
• COMPOSE_PROJECT_NAME=ngmocks_7937 sh ./test.sh coverage

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dd917e0) to head (65614e0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main    #13312    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          228       230     +2     
  Lines         4168      4284   +116     
  Branches      1187      1218    +31     
==========================================
+ Hits          4168      4284   +116     

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