Drop D9 and D8 support and fix scrollama.js eslint errors

D8 and D9 end of life has been reached (well, D9 in a few days from this issue report). Drop support and allow to fix eslint errors on
scrollama.js file:


1:2 warning Unexpected unnamed function func-names
4:44 warning Unexpected unnamed function func-names
70:9 warning Unexpected console statement no-console
71:28 warning Unexpected unnamed function func-names
82:24 error 'scrollama' is not defined no-undef
91:22 warning Unexpected unnamed function func-names
93:22 warning Unexpected unnamed function func-names
97:21 warning Unexpected unnamed function func-names
101:24 warning Unexpected unnamed function func-names


Most are linked to this: #2938692: JS closure results in "Unexpected unnamed function" warning from eslint.

This should de done in a 2.x branch because it includes breaking changes.