[1305] Fix update of the default tools of the palette's tool sections

[AxelRICHARD]

Bug: #1305

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[AxelRICHARD]

Cypress test seems unpredictable, need to find an alternative.

[sbegaudeau]

Minor nitpick, either you want to explicitly handle nothing as an explicit value and in this case use string | null but if you want to provide an optional prop on a component you should probably use defaultToolId?: string. With this, you do not have to specify <ToolSection defaultToolId={undefined} /> which is not very sexy.

Most of the time, I prefer that we handle explicitly null values but for the props of a component, an optional prop is perfectly fine. It works the same for simple boolean-based props for example to be able to have something like this:

<Something />
<Something />
<Something disabled />
<Something />

And not

<Something disabled={false} />
<Something disabled={false} />
<Something disabled={true} />
<Something disabled={false} />

[sbegaudeau]

I'll merge it once the build is green