Async Finding Import: Mark the feature as deprecated

[Jino-T]

• Added warnings to async_process_findings

• Added comments in settings.dist.py

Note:
I took the text for the warnings and comments from the documentation . Let me know if I should change this text to something potentially more helpful.

[sc-6355]

[dryrunsecurity]

DryRun Security Summary

Deprecation warnings have been added for DefectDojo's experimental async finding import feature across multiple files to alert users about potential inconsistencies and data integrity issues starting from version 2.44.0.

Expand for full summary

The PR adds deprecation warnings to async finding import features across multiple files in DefectDojo, indicating the experimental feature's deprecation as of version 2.44.0. Security findings include:

1. Potential inconsistency risks with experimental async finding import feature across base_importer.py, default_importer.py, default_reimporter.py, and settings.dist.py
2. Warning users about potential data integrity issues when using deprecated async processing methods
3. Proactive communication of experimental feature limitations that could lead to unexpected results

No direct security vulnerabilities were identified in the patch.

Code Analysis

We ran 7 analyzers against 4 files and 1 analyzer had findings. 6 analyzers had no findings.

Analyzer	Findings
Configured Codepaths Analyzer	3 findings

Overall Riskiness

🔴 Risk threshold exceeded.

We've notified @mtesauro, @grendel513.

View PR in the DryRun Dashboard.

[mtesauro]

Approved