test: add contract tests for tiles caching

[Trinaa]

Description

• Update docker-compose.yml:
  • Set the contile CONTILE_TILES_TTL environment variable to 0, preventing interactions between scenario executions due to tiles caching.
• Update scenarios.yml:
  • Add success_tiles_cache_expired in order to test that Contile requests tiles from the partner, when its cached tiles are expired.
• Create scenarios_tiles_cache.yml:
  • Add success_tiles_cache_with_same_form_and_region in order to test that Contile will use tiles from its cache, instead of from the partner, for requests that map to the same form-factor and region.
  • Add success_tiles_cache_with_different_form_and_region in order to test that Contile will use tiles from the partner, instead of from its cache, for requests that map to different form-factors and regions.
• Create docker-compose.tiles_cache.yml:
  • Set the contile CONTILE_TILES_TTL environment variable to 900 (15 minutes is the production default)
  • Set the client SCENARIOS_FILE environment variable to scenarios_tiles_cache.yml
• Update the CircleCI config to include the tiles cache tests
• Update the contract-tests README sequence diagram

Issue(s)

CONSVC-1232

[hackebrot]

Hi @Trinaa! 👋🏻

This is almost ready to be merged! There's one issue with the sequence diagram. I added my comment inline.

[hackebrot]

LGTM! 🚀