[backend] ”Saved filters” module implemented

[CelineSebe]

Proposed changes

• New Saved Filter module created
• saved filter resolver tests added

Related issues

• Save Filter View: first development #6044

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

Attention: Patch coverage is 91.52542% with 10 lines in your changes missing coverage. Please review.

Project coverage is 65.08%. Comparing base (2c0eb72) to head (b386c01).
Report is 30 commits behind head on release/6.6.0.

Files with missing lines	Patch %	Lines
...l/src/modules/savedFilter/savedFilter-converter.ts	33.33%	8 Missing ⚠️
...cti-graphql/src/modules/savedFilter/savedFilter.ts	96.96%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release/6.6.0   #10150      +/-   ##
=================================================
+ Coverage          64.61%   65.08%   +0.46%     
=================================================
  Files                659      665       +6     
  Lines              64863    65167     +304     
  Branches            7110     7723     +613     
=================================================
+ Hits               41912    42413     +501     
+ Misses             22951    22754     -197     

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