fix ModelNodeArgs.fqn

[MichelleArk]

resolves #8374
docs dbt-labs/docs.getdbt.com/#

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[github-actions]

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[codecov]

Codecov Report

Merging #8364 (c7433a0) into main (83ff38a) will decrease coverage by 0.05%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8364      +/-   ##
==========================================
- Coverage   86.29%   86.25%   -0.05%     
==========================================
  Files         174      174              
  Lines       25529    25535       +6     
==========================================
- Hits        22030    22024       -6     
- Misses       3499     3511      +12     

Flag	Coverage Δ
integration	82.99% <33.33%> (-0.13%)	⬇️
unit	65.18% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
core/dbt/contracts/graph/nodes.py	94.49% <ø> (ø)
core/dbt/contracts/graph/node_args.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes