fedcode-next: Collect fix commits from pre-existing datasets

[pombredanne]

We should focus on the database of manually reviewed fix commits and avoid automated fix commits.

Databases Requiring Review:

1. project-kb:

• https://github.com/SAP/project-kb/tree/vulnerability-data
• https://github.com/SAP/project-kb/tree/main/MSR2019

2. vulncode-db

• Collect fix commits from https://github.com/google/vulncode-db/  #118

3. linux_kernel_cves

• Import data from https://github.com/nluedtke/linux_kernel_cves #564

4. Morefixes:

• https://github.com/JafarAkhondali/Morefixes

5. MSR_20_Code_vulnerability_CSV_Dataset
   https://github.com/ZeoVan/MSR_20_Code_vulnerability_CSV_Dataset

6. GNU Libc fix commits

• Add glibc advisories #1362

related issue

• Collect existing fix commits and patches open datasets #1697