fix: properly load gateway arguments from YAML

[alaeddine-13]

closes: #5662

[codecov]

Codecov Report

Merging #5664 (699f42f) into master (723feef) will decrease coverage by 2.42%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master    #5664      +/-   ##
==========================================
- Coverage   86.43%   84.02%   -2.42%     
==========================================
  Files         132      130       -2     
  Lines       10304    10270      -34     
==========================================
- Hits         8906     8629     -277     
- Misses       1398     1641     +243     

Flag	Coverage Δ
jina	84.02% <87.50%> (-2.42%)	⬇️

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

Impacted Files	Coverage Δ
jina/serve/runtimes/gateway/__init__.py	98.36% <ø> (ø)
jina/jaml/parsers/gateway/legacy.py	76.92% <87.50%> (-23.08%)	⬇️
...estrate/deployments/install_requirements_helper.py	20.21% <0.00%> (-46.81%)	⬇️
jina/jaml/parsers/deployment/legacy.py	51.85% <0.00%> (-44.45%)	⬇️
jina/serve/monitoring.py	57.14% <0.00%> (-42.86%)	⬇️
jina/jaml/parsers/executor/legacy.py	51.92% <0.00%> (-36.54%)	⬇️
jina/clients/mixin.py	66.10% <0.00%> (-30.51%)	⬇️
jina/logging/formatter.py	72.00% <0.00%> (-28.00%)	⬇️
jina/serve/instrumentation/__init__.py	78.48% <0.00%> (-20.26%)	⬇️
... and 47 more

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