test(IDX): increase timeout to 15m for the ic_icp_index_test (#3112) #21319

Job	Run time
Bazel Build Fuzzers	2m 3s
Bazel Build All Config Check	0s
Bazel Test macOS Intel	1h 23m 9s
Bazel Build Fuzzers AFL	5m 32s
Build IC	18m 53s
Cargo Build Release Linux	23s
Cargo Clippy Linux	24s
Bazel Test All	38m 28s
Python CI Tests	2m 4s
Build Determinism (//publish/binaries:upload, release, build-ic/release, false)	34s
Build Determinism (//publish/canisters:upload, canisters, build-ic/canisters, false)	40s
Build Determinism (//ic-os/guestos/envs/prod:upload_disk-img, guest-os/update-img, build-ic/icos/...	30s
Build Determinism (//ic-os/hostos/envs/prod:upload_update-img, host-os/update-img, build-ic/icos/...	31s
Build Determinism (//ic-os/setupos/envs/prod:upload_disk-img, setup-os/disk-img, build-ic/icos/se...	35s
	2h 33m 46s

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