fix: updated 'Load a Workflow' to open the Upload Workflows modal

[KanvaBhatia]

Closes #1173

📑 Description

This button was not responsive -

Change behaviour to open the Upload Workflows modal when clicked on Load a Workflow.

✅ Checks

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [ ] All the tests have passed

ℹ Additional Information

https://github.com/keephq/keep/assets/56185464/add32501-2155-475f-bd59-0dcddc443264

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