Move `datasource/host` to `pkg` #5562

Job	Run time
set-vars	2s
Lint	6m 28s
Build Unsigned Snapshot	3m 4s
Unit Tests	2m 39s
Performance Tests	7m 31s
Unit tests with race condition detection	3m 13s
Load Tests	4m 58s
Integration Tests - Official OSS Images (bookworm, stable, debian)	5m 41s
Integration Tests (redhatenterprise, 9)	6m 5s
Integration Tests - Official OSS Images (alpine, stable, alpine)	5m 29s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	6m 6s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	5m 33s
Integration Tests (ubuntu, 24.04)	6m 19s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	5m 32s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	5m 18s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	5m 34s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	5m 40s
Integration Tests (alpine, 3.22)	5m 15s
	1h 30m 27s

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