fix: pass extra search paths

[numb3r3]

Pull Request Title

Description

The extra_search_paths in the following example is not considered:

f = Flow.load_config('clip.yml', extra_search_paths=['/path/to/folder'])

# clip.yml
jtype: Flow
version: '1'
with:
  port: 51000
executors:
  - name: clip_t
    uses:
      jtype: CLIPEncoder
      metas:
        py_modules:
          - executors/clip_torch.py

Closes # (issue)

[codecov]

Codecov Report

Merging #4651 (d019284) into master (73718c9) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4651      +/-   ##
==========================================
+ Coverage   87.46%   87.70%   +0.24%     
==========================================
  Files         117      117              
  Lines        8526     8526              
==========================================
+ Hits         7457     7478      +21     
+ Misses       1069     1048      -21     

Flag	Coverage Δ
jina	87.70% <100.00%> (+0.31%)	⬆️

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

Impacted Files	Coverage Δ
jina/jaml/__init__.py	94.38% <ø> (ø)
jina/__init__.py	67.46% <100.00%> (ø)
...a/orchestrate/deployments/config/docker_compose.py	98.97% <0.00%> (-1.03%)	⬇️
jina/helper.py	83.20% <0.00%> (-0.30%)	⬇️
jina/orchestrate/deployments/config/helper.py	98.24% <0.00%> (+1.75%)	⬆️
...deployments/config/k8slib/kubernetes_deployment.py	51.21% <0.00%> (+2.43%)	⬆️
jina/orchestrate/deployments/__init__.py	86.83% <0.00%> (+3.54%)	⬆️
...rate/deployments/config/k8slib/kubernetes_tools.py	100.00% <0.00%> (+21.42%)	⬆️

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