Bug in download estimate function changed for Guestbook-at-request functionality

[qqmyers]

What steps does it take to reproduce the issue?
Seen at QDR: An error in the estimateGuestBookResponseTableSize function added to postgres was introduced in #9599. The new code to estimate what fraction of guestbook table entries relate to downloads and not to access requests incorrectly give the type bigint to a number that is a fraction. See

dataverse/src/main/resources/db/migration/V6.0.0.1__9599-guestbook-at-request.sql

Line 51 in 6cfe43a

ELSE 1 - (SELECT (most_common_freqs::text::text[])[array_position(most_common_vals::text::text[], 'AccessRequest')]::bigint

. Changing the type to float resolves the issue.

• When does this issue occur?
  When the number of guestbook entries is large enough and guestbook-at-request functionality has been enabled.

• Which page(s) does it occurs on?
  Homepage showing the download count

• What happens?
  Causes a 500 error

Which version of Dataverse are you using?
develop

PR to follow