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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• If relevant, a test for the change is included or updated with this PR.
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[Khuzaima05]

Picker widget snapshot :

[Khuzaima05]

/run pipeline

[Khuzaima05]

/run pipeline

[ocofaigh]

see comment

[ocofaigh]

actually for consistency, lets go with existing_secrets_manager_instance

[Khuzaima05]

Done

[terraform-ibm-modules-ops]

🎉 This PR is included in version 4.2.0 🎉

The release is available on:

• GitHub release
• v4.2.0

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