UI: Please change memory setting in flex compute offering from MiB to GiB

### The required feature described as a wish

As a user, I'd like to be able to set the memory size of my instances in GiB without having to calculate the correct MiB value.
Entering values in MiB tends to lead to entering round numbers of 1,000. This then results in odd GiB values.
If a VM with less than 1 GiB is ever actually needed, you can enter 0.5 GiB, for example.
However, this use case is likely to occur much less frequently than higher GiB values.

Maybe it could include a drop-down menu next to the value that uses GiB as the default but also allows MiB to be selected. But I think GiB is the most helpful for most people.

Comece localizando a UI da oferta de flex compute e o campo de memória que atualmente aceita valores em MiB; em seguida, verifique os testes de UI próximos. O trabalho estará concluído quando os usuários puderem inserir memória em GiB por padrão, incluindo valores fracionários como 0.5, com a alternativa solicitada em MiB caso o design existente ofereça suporte a um seletor de unidade.

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