dns gateway: create manifest for every filter (#537) #1567

Job	Run time
changes	6s
e2e-check	1m 15s
discover	5s
wasm-checks / wasm-checks (example-wasm-go, wasm, go, example-wasm-go)	1m 42s
extproc-checks / extproc-checks (example-ext-proc, ext_proc, go, example-ext-proc)	2m 8s
rust-checks / rust-checks (ip-restriction, rust, rust, ip-restriction)	2m 22s
rust-checks / rust-checks (dns-gateway, rust, rust, dns-gateway)	3m 38s
go-checks / go-checks	1m 55s
e2e (dev)	3m 20s
e2e (1.38.0)	3m 24s
extensions-checks	2s
	19m 57s

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