[Feature] Slim down last_date logic in int_salesforce__date_spine - use current_date

[fivetran-jamie]

Is there an existing feature request for this?

• I have searched the existing issues

Describe the Feature

This came out of #48

This logic seems a bit roundabout and maybe wholly unnecessary, as when would the max(created_at) for a lead or opportunity ever be > the current_date? Perhaps we can automatically use the current_date as the last date for the date_spine, which is typically what we do in other packages.

Describe alternatives you've considered

Leave it and the potentially unnecessary run_queries in there

Are you interested in contributing this feature?

• Yes.
• Yes, but I will need assistance and will schedule time during your office hours for guidance.
• No.

Anything else?

No response