Added service dropdown picker with null support to the platform_resource widget

[Khuzaima05]

Description

Enhanced the platform_resource widget to support service dropdowns picker.

issue: https://github.ibm.com/GoldenEye/issues/issues/16407

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Release notes content

• Added support for service dropdown picker in the platform_resource widget.
• The dropdown also includes a null option, allowing users to choose null.

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[Khuzaima05]

Picker widget snapshot :

[Khuzaima05]

/run pipeline