feat: flow step skipping

[HugoCasa]

Important

Add skip_if feature to allow conditional skipping of flow steps, with backend logic, frontend UI, and OpenAPI spec updates.

• Backend:
  • Add skip_if property to FlowModule in windmill-common/src/flows.rs.
  • Implement logic in push_next_flow_job() in windmill-worker/src/worker_flow.rs to evaluate skip_if condition and skip steps if true.
• Frontend:
  • Add FlowModuleSkip.svelte component for UI to set skip_if condition.
  • Update FlowBranchesAllWrapper.svelte, FlowBranchesOneWrapper.svelte, FlowLoop.svelte, FlowModuleComponent.svelte, FlowWhileLoop.svelte, and FlowModuleWrapper.svelte to include FlowModuleSkip.
• OpenAPI:
  • Update openflow.openapi.yaml to include skip_if property in FlowModule schema.

^{This description was created by for 6a84be5. It will automatically update as commits are pushed.}

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