Fix logs excluded multiple times if referenced multiple times in the config

[karensantana]

Proposed changes

When the same log is referenced in the NGINX config multiple times and included in the exclude logs option in the agent config the log is excluded multiple times. Agent has been modified to prevent excluding an access_log or error-log multiple times if it is referenced multiple times in the NGINX config file.

Unit tests covering each scenario have been added.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.88%. Comparing base (a52371a) to head (c194451).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1695      +/-   ##
==========================================
+ Coverage   84.86%   84.88%   +0.01%     
==========================================
  Files         105      105              
  Lines       13621    13632      +11     
==========================================
+ Hits        11559    11571      +12     
+ Misses       1539     1538       -1     
  Partials      523      523              

Files with missing lines	Coverage Δ
internal/datasource/config/nginx_config_parser.go	79.79% <100.00%> (+0.54%)	⬆️

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