refactor: switch to string entity type argument

[aaron-steinfeld]

Description

We deprecated the enum version of this and replaced with a string a little while back - making the change here in UI

Testing

Updated UT, manual verification

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #758 (48fac24) into main (c5cd97c) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   85.34%   85.35%   +0.01%     
==========================================
  Files         788      788              
  Lines       16129    16127       -2     
  Branches     2055     2055              
==========================================
  Hits        13765    13765              
+ Misses       2333     2331       -2     
  Partials       31       31              

Impacted Files	Coverage Δ
...argument/graphql-observability-argument-builder.ts	84.31% <ø> (-0.60%)	⬇️
...es/query/entities-graphql-query-builder.service.ts	100.00% <ø> (ø)
...y/entity-topology-graphql-query-handler.service.ts	95.50% <ø> (ø)
...uest/builders/argument/graphql-argument-builder.ts	100.00% <100.00%> (+7.14%)	⬆️

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[github-actions]

Unit Test Results

    4 files  ±0  247 suites  ±0   14m 20s ⏱️ -24s
884 tests ±0  884 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
890 runs  ±0  890 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit ea618f4. ± Comparison against base commit c5cd97c.