EPSS scores support

[dogboat]

Description

This patch adds support for storage of EPSS scores and percentiles on the Finding model. It displays these values on the Finding listing page and the single Finding view/edit pages.

Test results

No automated tests added. Testing done included:

• Testing the Finding listing page to make sure EPSS info shows up properly;
• Testing the single Finding page to make sure EPSS info shows up properly;
• Editing Findings through the edit Finding page to make sure values are set/validated properly;
• Retrieving/settings values through the API to make sure values are set/validated properly.

[sc-4117]

[dryrunsecurity]

Contextual Security Analysis

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Status	DryRun Security Check
✅	Sensitive Functions Analyzer
❌	Configured Sensitive Files Check
✅	Sensitive Files Analyzer

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[manuel-sommer]

I guess this PR can be closed because of #9516 @mtesauro.

[dogboat]

Closing as the work in #9516 covers this.