[ECS-Plugin] Implement Livestate Plugin

[armistcxy]

What this PR does: Implements the livestate plugin for the ECS plugin, enabling PipeCD to report the live state of ECS applications to the control plane

Why we need it:

Which issue(s) this PR fixes: Part of #6443

Does this PR introduce a user-facing change?: Yes

• How are users affected by this change: Without this, PipeCD has no visibility into the live state of ECS applications after deployment. Users cannot tell whether their ECS serviceis healthy, how many tasks are running vs desired, or whether the cluster is drifted from the declared Git state.
• Is this breaking change:
• How to migrate (if breaking change):

[armistcxy]

Some screenshots as proof:

Overview

Resource detail

Note

There's an issue with the UI (pipecd/web) that seems like currently support only K8s (my guess because I see "Kind", "Namespace", "API Version")

I quick fix the issue with Claude Code just to verify the livestate plugin implementation, have a look here

pipecd/web/src/components/application-detail-page/application-state-view/live-state-view/resource-detail/index.tsx

Lines 19 to 75 in 223a972

	export const ResourceDetail: FC<ResourceDetailProps> = ({
	resource,
	onClose,
	}) => {
	return (
	<PanelWrap square>
	<CloseButton onClick={onClose} size="large">
	<CloseIcon />
	</CloseButton>
	<PanelTitle>{resource.name}</PanelTitle>
	<Box
	sx={{
	pt: 1,
	display: "flex",
	alignItems: "center",
	}}
	>
	<InfoRowTitle>Kind</InfoRowTitle>
	<InfoRowValue>
	{findMetadataByKey(resource.resourceMetadataMap, "Kind")}
	</InfoRowValue>
	</Box>
	<Box
	sx={{
	pt: 1,
	display: "flex",
	alignItems: "center",
	}}
	>
	<InfoRowTitle>Namespace</InfoRowTitle>
	<InfoRowValue>
	{findMetadataByKey(resource.resourceMetadataMap, "Namespace")}
	</InfoRowValue>
	</Box>
	<Box
	sx={{
	pt: 1,
	display: "flex",
	alignItems: "center",
	}}
	>
	<InfoRowTitle>Api Version</InfoRowTitle>
	<InfoRowValue>
	{findMetadataByKey(resource.resourceMetadataMap, "API Version")}
	</InfoRowValue>
	</Box>
	<Box
	sx={{
	pt: 1,
	}}
	>
	<InfoRowTitle>Health Description</InfoRowTitle>
	<InfoRowValue>{resource.healthDescription || "Empty"}</InfoRowValue>
	</Box>
	</PanelWrap>
	);
	};

.

will create a PR soon ^^