fix: update design of update component

[lucaseduoli]

This pull request includes several changes to the NodeStatus and GenericNode components, as well as updates to styles and constants. The most important changes focus on improving the visual indicators and handling of outdated nodes, along with some code cleanup.

Improvements to NodeStatus and GenericNode components:

• src/frontend/src/CustomNodes/GenericNode/components/NodeStatus/index.tsx: Removed unused props handleUpdateCode and loadingUpdate from NodeStatus component and added updateClass for visual indication of outdated nodes. [1] [2] [3] [4] [5] [6]
• src/frontend/src/CustomNodes/GenericNode/index.tsx: Added a warning banner for outdated nodes and removed the unused props handleUpdateCode and loadingUpdate from GenericNode component. [1] [2] [3] [4] [5]

Style and constants updates:

• src/frontend/src/style/index.css: Added new CSS variables for warning colors. [1] [2]
• src/frontend/tailwind.config.mjs: Updated Tailwind configuration to include the new warning color variables.
• src/frontend/src/components/ui/button.tsx: Added a new warning variant to the button component.

Code cleanup:

• src/frontend/src/CustomNodes/hooks/use-check-code-validity.tsx: Removed unused import nodeNames.
• src/frontend/src/CustomNodes/GenericNode/components/NodeStatus/index.tsx: Removed unused constant TOOLTIP_OUTDATED_NODE.

[Cristhianzl]

lgtm