[Technical Task][Admin/New Streetcode][Dropdown lists] Bringing dropdown lists to single style and logic on the 'Створити стріткод' page

[mozhaieva]

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The 'Новий Стріткод' page contains dropdown lists:

1. 'Теги'
2. 'Зв'язки історії(Стріткоди)'
3. 'Партнери',

but they have different styles and logic.

There is a proposal to take the 'Tags' dropdown list as a reference to bring the dropdown lists to the same format.

Also pay attention that the 'Tags' dropdown list should also be completed by the placeholder text, chevron icon and pointer cursor when hovering on chevron icon (instead of text cursor) in the dropdown field.

User story #115 User story #499