Update desktop toolchains for ESR 78

This is the parent ticket for all desktop toolchain related work.

• #34228 (closed)
• #34229 (closed)
• #34230 (closed)
• #34388 (closed)
• #34390 (closed)
• #34391 (closed)
• #40004 (closed)
• #40005 (closed)
• #40006 (closed)
• #40020 (closed)
• #40026 (closed)
• #40027 (closed)