Fix tasklist completion message when no tasks are completed

[chihsuan]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Closes #37554.

When one of the tasks is visited and no tasks are completed, the message should say Let's get you started.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Start a fresh site
2. Skip the onboarding wizard so no tasks complete
3. Go to WooCommerce > Home
4. See the message above the task list
5. The message should display "Welcome to your store"
6. Click on Add products task
7. Go back to WooCommerce > Home
8. The message should display "Let's get you started 🚀"

[github-actions]

Hi @ilyasfoo, @rjchow, @woocommerce/ghidorah

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[github-actions]

Test Results Summary

Commit SHA: b9ea74b

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	267	0	0	2	0	269	1m 15s
E2E Tests	187	0	0	10	0	197	14m 41s

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To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[rjchow]

Looks good, tests well! Thanks for adding tests! 🚢

[chihsuan]

Going to merge this with one approval only since it's a small change and I've also added tests for it.