🍒 Remove support for Heroku deployment (#25124)

[nemanjaglumac]

Manual backport of #25124

[codecov]

Codecov Report

Base: 64.25% // Head: 64.25% // No change to project coverage 👍

Coverage data is based on head (d4511b2) compared to base (77602cc).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-x.45.x   #26298   +/-   ##
===============================================
  Coverage           64.25%   64.25%           
===============================================
  Files                3146     3146           
  Lines               92105    92105           
  Branches            11687    11688    +1     
===============================================
  Hits                59181    59181           
+ Misses              28246    28245    -1     
- Partials             4678     4679    +1     

Flag	Coverage Δ
back-end	85.55% <ø> (ø)
front-end	45.13% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/metabase/models/query.clj	92.30% <0.00%> (ø)

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