gtk3, gtk4: refactor buttons heavily, make look near-identical to breeze qstyle
BUG: 426557 BUG: 438185 CCBUG: 443919 (cherry picked from commit 19e285b4)
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BUG: 426557 BUG: 438185 CCBUG: 443919 (cherry picked from commit 19e285b4)