Fixes to managers for mergable models

[johniak]

This pull request includes several changes aimed at improving the handling of merge status objects in the household schema and permissions. The most important changes include modifications to the get_node method, updates to various resolve methods to use all_merge_status_objects, and adjustments to the SoftDeletableRepresentationMergeStatusModel.

Improvements to handling merge status objects:

• src/hct_mis_api/apps/account/permissions.py: Updated the get_node method to accept additional keyword arguments and use get_object_queryset if provided.
• src/hct_mis_api/apps/household/schema.py: Added the get_node method to the IndividualNode and Household classes to use all_merge_status_objects for querying. [1] [2]
• src/hct_mis_api/apps/household/schema.py: Updated various resolve methods to use all_merge_status_objects for querying related objects, ensuring consistent handling of merge status. [1] [2] [3] [4]

Adjustments to model managers:

• src/hct_mis_api/apps/utils/models.py: Changed the SoftDeletableRepresentationMergeStatusModel to use SoftDeletableRepresentationMergedManager for the objects manager, ensuring proper filtering by rdi_merge_status.

Minor changes:

• src/frontend/src/containers/tables/rdi/ImportedHouseholdsTable/ImportedHouseholdTableRow.tsx: Simplified the display logic for household IDs in the ImportedHouseholdTableRow component.
• src/hct_mis_api/apps/household/schema.py: Added the Model import to the schema file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.66%. Comparing base (62c8f66) to head (386b269).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4528   +/-   ##
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  Coverage   84.65%   84.66%           
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  Files         508      508           
  Lines       36224    36232    +8     
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+ Hits        30667    30675    +8     
  Misses       5557     5557           

Flag	Coverage Δ
e2e	62.62% <100.00%> (+0.05%)	⬆️
unittests	82.90% <85.71%> (+<0.01%)	⬆️

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