Improve handling of overage spend

[fernandobrito]

In a previous PR (#152), I added new Snowflake services to hourly_spend. For some services, the cost was calculated by taking the daily spend from the USAGE_IN_CURRENCY_DAILY view and splitting it by each hour of the day.

The values in the column usage_type in USAGE_IN_CURRENCY_DAILY can be prefixed with overage- if they come from overage spend, and this was not taken into account in my previous PR.

Similar to what this library does to the daily_rates (source), this PR normalizes the value in this column by removing overage- if it's present.

The following services were added in my previous PR:

• Reader account (compute, storage, cloud services, data transfer): affected. Fixed in this PR.
• AI Services: affected. Fixed in this PR.
• Logging: affected. Fixed in this PR.
• Hybrid Tables (storage and request costs): not affected
• SnowPark Container Services: not affected
• Copy Files (serverless cost for copying files between named stages): not affected

The following services were not added in the previous PR but were affected and have now been fixed:

• Data Transfer

QA

Tested locally.