Button styling for Date dropdown, Dropdown, Expanding search

[LukasGrafUX]

Prerequisites

• I have read the Contributing Guidelines.
• I have not leaked any internal/restricted information like screenshots, videos, code snippets, links etc.

Suggestion / feature request

Status Quo:
Currently the dropdown button for the date dropdown component can’t be styled (primary and secondary looks). II guess this is also true for other dropdown buttons. This is also true for the button of the expanding search.

Related components:
https://ix.siemens.io/docs/controls/date-dropdown
https://ix.siemens.io/docs/controls/dropdown
https://ix.siemens.io/docs/controls/expanding-search

Goal:
Having the opportunity to style date dropdown, dopdown, expanding search buttons the same way as regular buttons already do (primary with all variants and secondary with all variants).

[github-actions]

🤖 Hello @LukasGrafUX

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JIRA: IX-1941