fix: [M3-7099] - Metadata CLI command

[hana-akamai]

Description 📝

Fix metadata command when creating with the Linode CLI

Preview 📷

Before	After

How to test 🧪

yarn test packages/manager/src/utilities/generate-cli.test.ts

• Go to /linodes/create and fill out the create form with a cloud-init compatible image and a metadata compatible region (e.g. Washington, DC)
• Enter some text in the User Data field of the Add User Data accordion
• Click the Create Using Command Line button and click on the Linode CLI tab
• Ensure that the metadata command is --metadata.user_data="<user_data>" instead of --metadata '{"user_data": "<user_data>"}'

[abailly-akamai]

👍