feat(FSADT1-1346): add create client button to staff dashboard

[paulushcgcj]

Description

For staff users to be able to create a new client on behalf of someone else, we should add a button on the staff screen left-hand side menu, right below the existing dashboard button to allow staff users to create a new client. This button should only be visible and accessible to staff users with the correct role.

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation update

How Has This Been Tested?

• New unit tests
• New component tests
• New end-to-end tests

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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[github-actions]

Current changelog

Bug Fixes

• FSADT1-1346: fixing tests with feature flag (1f81a2a)

Features

• FSADT1-1346: add create client to staff dashboard (8582ad1)
• FSADT1-1346: soft-locking feature behind a feature flag (83b0caa)

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[fterra-encora]

Hey, I left a few comments.
I guess they are not very important, but I think it's preferable to just add the things I noticed.
Other than these comments, it looks great to me.

[github-actions]

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[github-actions]

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[github-actions]

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