Feature Addition: Filter by Data Sources

[vynttran]

trafficstars

• Resolves feature request in #608
• Description: With this new addition, the filter menu dropdown would have not just the filter by platforms section, but also a filter by data sources section.
• Implementation: As a search based on data sources feature already exists in the current version of the Navigator, we built this addition based off of that, which should ensure the technique-to-source mappings are accurate, and so is this added filtering functionality. Below is a screenshot of what the addition would look like:

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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[clemiller]

Hi all, please ping me when this PR is ready for review and I will take a look. Thanks!