Rename Falcon PADDED variants

[SWilson4]

Concerns were raised downstream about the naming convention for the recently added Falcon PADDED variants. This PR updates the name to be more usable by downstream consumers of PQClean. No functionality is changed.

Manually checked properties

• Generated Github workflow (run .github/workflows/generate_workflows.py) (new schemes)
• No stringification macros
• Output-parameter pointers in functions are on the left
• Negative return values on failure of API functions (within restrictions of FO transform).
• variable declarations at the beginning (except in for (size_t i=...)
• Optional:
  • All integer types are of fixed size, using stdint.h types (including uint8_t instead of unsigned char)
  • Integers used for indexing are of size size_t

[baentsch]

FWIW LGTM, even though I don't understand all machinery at play here (is there some cron CI still waiting to be run?). The YMLs' particularly look OK.

[SWilson4]

CI tracking this branch is passing through both liboqs and oqs-provider.