Fixes:

The regression is due a recent change I made to the SelectControl
component: https://github.com/twentyhq/twenty/pull/8125.
The SelectControls get applied `text-align: center` due to the styles
`react-datepicker` applies to the header component. My grid
implementation makes the label take all the available width. I could
have let it take an `auto` width, but I think it's better to set the
`text-align` property and ensure the `SelectControl` component behaves
predictably.
Closes#7906
Modified the two children(`TextInputV2` and `CountrySelect`) in the
`StyledHalfRowContainer` component to always be equal in size and divide
the available space equally.
The `StyledIconChevronDown` component has a `flex-shrink: 0` to prevent
it from completely disappearing. The same applies for the
`selectedOption.Icon`.
A `p` tag had to be added to the label to correctly handle the text
overflow.
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Co-authored-by: Devessier <baptiste@devessier.fr>