Gradients: Enable adding custom gradient when gradients are disabled#36900

oandregal merged 5 commits intotrunkWordPress/gutenberg:trunkfrom

update/gradient-picker-to-support-custom-gradient-when-gradients-are-emptyWordPress/gutenberg:update/gradient-picker-to-support-custom-gradient-when-gradients-are-emptyCopy head branch name to clipboard