fix: adjust proxy implementation

[pcomp96]

• Removed Objects.requireNonNull(port, "Http Port cannot be null"); because port is a primitive value
• Move the following snippet of code before of authentication required check

sharedClient = sharedClient.newBuilder()
               .proxySelector(proxySelector)
               .build();

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (86e38de) 84.35% compared to head (06ba226) 85.95%.

Files	Patch %	Lines
...sapp/api/utils/proxy/CustomProxyAuthenticator.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #122      +/-   ##
============================================
+ Coverage     84.35%   85.95%   +1.59%     
- Complexity      492      498       +6     
============================================
  Files           159      159              
  Lines          1189     1189              
  Branches         12       12              
============================================
+ Hits           1003     1022      +19     
+ Misses          168      148      -20     
- Partials         18       19       +1     

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