Misc: Add script creating DCA source suites from MRVA

[tausbn]

The script takes the URL of a MRVA exported Gist and uses it to produce a source suite compatible with DCA.

At present, you have to manually specify the language on the commandline, using the --language parameter.

Also supports --min and --max parameters if you want to limit the sources to ones with a bounded number of alerts.

[Copilot]

Pull Request Overview

This PR adds a Python script to convert a MRVA-exported GitHub Gist into a DCA-compatible source suite, with support for specifying the analysis language and filtering by alert count.

• Introduces mrva-to-dca-source-suite.py to clone a MRVA Gist, parse its summary, and generate a YAML source suite
• Adds command-line arguments --language, --min, and --max
• Implements parsing for repo alert counts and SHA extraction to populate the suite

Comments suppressed due to low confidence (3)

misc/scripts/mrva-to-dca-source-suite.py:6

• The import defaultdict is never used in this script. Please remove it to avoid unused imports.

from collections import defaultdict

misc/scripts/mrva-to-dca-source-suite.py:56

• [nitpick] The variable name d is ambiguous. Consider renaming it to alert_counts or a more descriptive name.

        d = {}

misc/scripts/mrva-to-dca-source-suite.py:108

• The filtering logic for filtered_alerts (min/max bounds) isn't covered by existing tests; please add unit tests validating boundary conditions.

    filtered_alerts = {