Change lifetime funding to estimate on explorer page

[nfrgosselin]

User Story: As a grantee I want to display an estimated lifetime funding amount (instead of an "exact" number) So that contributors know how to contextualize the number

Acceptance Criteria GIVEN that I am on the Grant Explorer WHEN I look at the dollars raised on a grant's card THEN the "total raised" copy is replaced with "Estimated total raised"

GIVEN that I am on the Grant Explorer and looking at a specific grant card WHEN the grant has earned <$1,000 THEN the number displayed is "<$1,000"

GIVEN that I am on the Grant Explorer and looking at a specific grant card WHEN the grant has earned >$1,000 THEN the display reads "~$N", where N is the amount rounded to the nearest thousand (instead of an exact dollar amount)

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