Resolve "Remove default value for `organization_id` from SBOM tables"

What does this MR do and why?

The organization_id column is now set by the backend when ingesting SBOMs and when exporting vulnerabilities and dependency lists. It should no longer have a default value.

• Remove default value for organization_id column (sharding key) from the following tables:
  • sbom_sources
  • sbom_source_packages
  • sbom_components
  • sbom_component_versions
  • vulnerability_exports
  • vulnerability_export_parts
  • dependency_list_exports – no default value
  • dependency_list_export_parts
• Update MigrateOsSbomOccurrencesToComponentsWithoutPrefix to set organization_id during the migration. Update specs. NOTE: This BBM should be finalized and removed. See #495497 and !166999 (comment 2129216646).
• Update specs of UpdateSbomOccurrencesComponentNameBasedOnPep503. NOTE: This BBM should be finalized and removed. See #495487 and !166999 (comment 2127337661).

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Related to #480423 (closed)