Adds first pass at env var only deployments

[bomoko]

This adds a very, very rudimentary implementation of environment variable only deployments - primarily to show how/that it can be done in the UI very simply.

[Copilot]

Pull request overview

This PR introduces a new deployment mode for environment variable-only deployments, providing users with the option to quickly apply variable changes without rebuilding container images. The implementation adds a mutation parameter to the GraphQL query and creates a new UI with card-based deployment type selection.

• Extends the deployEnvironmentLatest mutation to accept an envVarOnly parameter that sets the LAGOON_VARIABLES_ONLY build variable
• Introduces a card-based UI for selecting between "Full Deployment" and "Variables Only Deployment" modes
• Displays a warning message when variables-only deployment is selected to inform users about limitations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
src/lib/mutation/deployEnvironmentLatest.ts	Adds envVarOnly parameter and buildVariables array to pass LAGOON_VARIABLES_ONLY flag to the deployment API
src/components/pages/deployments/_components/DeployLatest.tsx	Refactors deployment UI to show deployment type selection cards, adds state management for deployment type, and includes a warning for partial deployments

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[CGoodwin90]

Made a few small updates:

• Updated CSS styling to Tailwind for consistency
• Replaced the DeployOptionCard component with the existing Button components (Can look at creating an actionButton component in the UI-Library for this kind of use case)
• Updated the loading state to match the new components & moved the logic out of DeployLatest and into the app router Loading

Everything else looks good

[bomoko]

@CGoodwin90 okay - this is great - I guess this should only be merged AFTER the API becomes generally available. So after rollout.