GdiEngine: Invalidate entire rows at a time

[lhecker]

This fixes an issue were overwriting parts of a row would only trigger
that specific portion of the row to be redrawn. This isn't just
problematic for combining characters, but also for things like
the new TestDbcsBisectWriteCells test introduced in #13626.

Benchmarks showed no impact on performance whatsoever.

Validation Steps Performed

• Pick this commit into Rewrite ROW to be Unicode capable #13626
• Run the TestDbcsBisectWriteCells test and break before OpenConsole exits
• A correct "QいかなZYXWVUTに" output is visible ✅

[zadjii-msft]

Sure, let's go for it. GDI doesn't have the bitmap for invalidation so we don't really need to worry about changing the invalid map to just a singular array of invalid rows (akin to dx). I'm cool with this.

[ghost]

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