feat: 🎸 show add worker filter when none set for targets

[cameronperera]

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-15760

Description

show add worker filter when none set for targets

Screenshots (if appropriate)

Before:

After:

How to Test

1. Navigate to workers tab on a Target
2. If there is no worker filter set, it should say "Add worker filter". If there is a worker filter it should say "Edit worker filter".
3. If you add or remove a worker filter, the text should change respectively.

Checklist

• I have added before and after screenshots for UI changes
• I have added JSON response output for API changes
• I have added steps to reproduce and test for bug fixes in the description
• I have commented on my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

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[lisbet-alvarez]

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