As a data developer, I want to update the code for Tree Equity Score to output census tracts rather than census block groups.

[lucasmbrown-usds]

Description See conversation at https://github.com/usds/justice40-tool/pull/1534/files#r896190347.

With officially moving over to only supporting tracts for data sources instead of tracts and block groups, the only block group oriented data source is Tree Equity Score.

See also #1805.