Design: Kubernetes Agent - Add Agent installation instructions in the UI
<!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Overview Enable users that have navigated to the Kubernetes UIs to be able to install a new Agent without navigating to the documentation and having to switch between GitLab UI, CLI and documentation. ### Proposal Provide the basic Agent installation instructions in the Agent listing page. |Empty state (disabled if no agent directory)| Empty state | Select Agent | Agent selected | Registering Agent | Generating token | Installation instructions| |-----------| ----------- | ----------- | ----------- | ----------- | ----------- |----| | ![000_Kubernetes_Agent_-_Empty_state_-_No_agent_directory](/uploads/c7953ecc6282261c80e22f67adb9ab63/000_Kubernetes_Agent_-_Empty_state_-_No_agent_directory.png)| ![001_Kubernetes_Agent_-_Empty_state__1_](/uploads/733feeaa9079b8062c13e177dcad4340/001_Kubernetes_Agent_-_Empty_state__1_.png)| ![006_Kubernetes_Agent_-_Select_Agent_-_Multiple_Agents](/uploads/2fa0b84f118e78d9f1649ec484c99d7d/006_Kubernetes_Agent_-_Select_Agent_-_Multiple_Agents.png) | ![007_Kubernetes_Agent_-_Select_Agent_-_Agent_selected](/uploads/82f3590d4190a9121defcf57443a4037/007_Kubernetes_Agent_-_Select_Agent_-_Agent_selected.png) | ![008_Kubernetes_Agent_-_Registering_Agent__1_](/uploads/718d2c00c8bc5bf9c3369c44a4f9bd09/008_Kubernetes_Agent_-_Registering_Agent__1_.png)|![010_Kubernetes_Agent_-_Generating_token__1_](/uploads/b397753c993a0bbbbb903e9db4a59ab2/010_Kubernetes_Agent_-_Generating_token__1_.png) | ![010_Kubernetes_Agent_-_Token_and_instructions](/uploads/d6e948181271fa09975f684eb3100d50/010_Kubernetes_Agent_-_Token_and_instructions.png) **Errors** |Agent failed to register| Token failed to be generated| |---|-----| |![009_Kubernetes_Agent_-_Registering_Agent_-_Error](/uploads/ff84cf280c7cfe3347390f55c574bec3/009_Kubernetes_Agent_-_Registering_Agent_-_Error.png) |![011_Kubernetes_Agent_-_Generating_token__1_](/uploads/4e65ac24fb4dbdb387865e7d83b7132e/011_Kubernetes_Agent_-_Generating_token__1_.png) | ### Related issues [Design - Import cluster GUI with agent setup](https://gitlab.com/gitlab-org/gitlab/-/issues/225226/) [Figma file](https://www.figma.com/file/2U5VzLV4jGw59Eghim2sN3/Kubernetes-Agent-Add-Agent-installation-instructions-in-the-UI-321408?node-id=140%3A24651)
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