Load one module at a time per harvest cycle

[lrafeei]

This PR attempts to fix an issue where some modules are not loaded in the environment section of the UI (the modules do not get passed into the update_loaded_modules endpoint.)

Previously the logic attempted to load as many modules as possible during a 2 second window by iterating through a plugins generator. However, it seems that some modules get missed (likely iterated but lacking the time to complete the information transfer to the endpoint).

Loading one module per harvest cycle is the attempt at fixing this. If the application completes before all the modules habe had time to load, the agent will revert to the previous connect logic of converting the remaining (unloaded) modules to a list and uploading them at once. The rationale is that the more modules an application has, the higher the likelihood that the application will be running longer as well.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	1.1s
✅ MARKDOWN	markdownlint	7	0	0	0	1.22s
✅ PYTHON	ruff	1036	0	0	0	1.19s
✅ PYTHON	ruff-format	1036	0	0	0	0.4s
✅ YAML	prettier	15	0	0	0	1.62s
✅ YAML	v8r	15		0	0	5.25s
✅ YAML	yamllint	15		0	0	0.66s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.87%. Comparing base (983474f) to head (2454063).

Files with missing lines	Patch %	Lines
newrelic/core/application.py	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1670      +/-   ##
==========================================
- Coverage   81.88%   81.87%   -0.02%     
==========================================
  Files         215      215              
  Lines       25861    25851      -10     
  Branches     4108     4107       -1     
==========================================
- Hits        21177    21166      -11     
- Misses       3303     3305       +2     
+ Partials     1381     1380       -1     

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