Apply gap testing to prices table

[Hosuke]

This pull request includes several changes to the dbt_subprojects/tokens project, focusing on adding data tests for price models and ensuring no missing prices for different time intervals. Additionally, it re-enables the test paths configuration.

Data tests for price models:

• dbt_subprojects/tokens/models/prices/_schema.yml: Added dbt_utils.unique_combination_of_columns data tests for prices_daily, prices_hourly, and prices_minute models to ensure unique combinations of blockchain, contract_address, and timestamp. [1] [2] [3]

Ensuring no missing prices:

• dbt_subprojects/tokens/tests/assert_no_missing_prices_day.sql: Added a SQL test to ensure there are no missing daily prices for each token.
• dbt_subprojects/tokens/tests/assert_no_missing_prices_hour.sql: Added a SQL test to ensure there are no missing hourly prices for each token.
• dbt_subprojects/tokens/tests/assert_no_missing_prices_minute.sql: Added a SQL test to ensure there are no missing minute-level prices for each token.
• dbt_subprojects/tokens/tests/schema.yml: Added schema definitions for the new data tests to ensure no missing prices at daily, hourly, and minute levels.

Configuration updates:

• dbt_subprojects/tokens/dbt_project.yml: Re-enabled the test-paths configuration to include the tests directory.

[Hosuke]

Seems the tests in the subproject tokens are not properly set up.

[Hosuke]

There are missing days in prices.day though:
https://github.com/duneanalytics/spellbook/actions/runs/11580094309/job/32237846434?pr=7060#step:13:23

[Hosuke]

Duped in prices.hour maybe:
https://github.com/duneanalytics/spellbook/actions/runs/11914294253/job/33201902504?pr=7060#step:13:29