chore: Remove the general currency formatter and its data once the currency sliced data and their formatter is implemented

[younies]

Summary

Remove the CurrencyEssentialsV1 data marker and general currency formatter once the sliced currency data implementation and its corresponding formatter are complete.

Background

The CurrencyEssentialsV1 marker is currently used as a temporary solution. Once we have proper sliced currency data and formatters implemented, this general approach should be deprecated and removed to maintain a clean codebase.

References

• Related to TODO comment in components/experimental/src/dimension/provider/currency/essentials.rs