ISAICP-7674: Post update functionality for v1.91.0 + hotfixed tickets

See merge request digit/digit-joinup-dev!616

(cherry picked from commit df14e875)

c83ba7c4 Merge branch 'release-1.91.0' into 'master'
c1579e53 ISAICP-7678: Upload a SVG from CKEditor (image inline).
79cbbfb5 ISAICP-7678: Upload a SVG from CKEditor test.
79a2e8e0 Merge branch 'ISAICP-7678' into 'master'
376d3694 ISAICP-7680: Include a patch for the svg issue.
7f9664f9 ISAICP-7680: Skip trying to create responsive images for svgs.
4197326a ISAICP-7680: Provide tests for all failing cases.
f3049f64 ISAICP-7680: Update the wording in tests.
97786ac5 Merge branch 'ISAICP-7680' into 'master'
0912c95e Merge remote-tracking branch 'origin/develop' into ISAICP-7674
91814062 ISAICP-7674: Post update procedure for v1.91.0.