[LIMA-2026] Update logo sponsor

[edanpiro]

This pull request updates the sponsor references for "fluidattacks" across multiple 2025 event configuration files. The main change is to replace the sponsor ID from fluidattacks to fluidattacks-before-20260528 in all relevant event files, and to add a corresponding sponsor metadata file. This likely reflects a change in how the sponsor should be referenced for events before a specific date.

Sponsor ID updates:

• Updated all 2025 event files to use fluidattacks-before-20260528 instead of fluidattacks as the sponsor ID:
  • data/events/2025/dallas/main.yml
  • data/events/2025/denver/main.yml
  • data/events/2025/lima/main.yml
  • data/events/2025/los-angeles/main.yml
  • data/events/2025/medellin/main.yml
  • data/events/2025/santiago/main.yml
  • data/events/2025/sao-paulo/main.yml

Sponsor metadata:

• Added new sponsor metadata file data/sponsors/fluidattacks-before-20260528.yml with the name and URL for "fluidattacks".

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