drop use of Snakemake 7.x-specific remote functionality

Snakefile

@@ -1,28 +1,17 @@
-configfile: "config.yaml"
-
-if config["remote"] == "S3":
-    from snakemake.remote.S3 import RemoteProvider as S3RemoteProvider
-    provider = S3RemoteProvider(
-        endpoint_url="https://eics3.sdcc.bnl.gov:9000",
-        access_key_id=os.environ["S3_ACCESS_KEY"],
-        secret_access_key=os.environ["S3_SECRET_KEY"],
-    )
-    remote_path = lambda path: f"eictest/{path}"
-elif config["remote"] == "XRootD":
-    from snakemake.remote.XRootD import RemoteProvider as XRootDRemoteProvider
-    provider = XRootDRemoteProvider(
-        stay_on_remote=False,
-    )
-    remote_path = lambda path: f"root://dtn-eic.jlab.org//work/eic2/{path}"
-else:
-    raise ValueError(f"Unexpected config[\"remote\"] = {config['remote']}")
-
 include: "benchmarks/backgrounds/Snakefile"
 include: "benchmarks/barrel_ecal/Snakefile"
 include: "benchmarks/ecal_gaps/Snakefile"
 include: "benchmarks/material_scan/Snakefile"
 
 
+rule fetch_epic:
+    output:
+        filepath="EPIC/{PATH}"
+    shell: """
+xrdcp root://dtn-eic.jlab.org//work/eic2/{output.filepath} {output.filepath}
+"""
+
+
 rule warmup_run:
     output:
         "warmup/{DETECTOR_CONFIG}.edm4hep.root",

benchmarks/ecal_gaps/Snakefile

@@ -3,7 +3,7 @@ import os
 
 rule ecal_gaps_sim:
     input:
-        steering_file=provider.remote(remote_path("EPIC/EVGEN/SINGLE/{PARTICLE}/{ENERGY}/{PHASE_SPACE}/{PARTICLE}_{ENERGY}_{PHASE_SPACE}.steer")),
+        "EPIC/EVGEN/SINGLE/{PARTICLE}/{ENERGY}/{PHASE_SPACE}/{PARTICLE}_{ENERGY}_{PHASE_SPACE}.steer",
         warmup="warmup/{DETECTOR_CONFIG}.edm4hep.root",
     output:
         "sim_output/{DETECTOR_CONFIG}/{PARTICLE}/{ENERGY}/{PHASE_SPACE}/{PARTICLE}_{ENERGY}_{PHASE_SPACE}.{INDEX}.edm4hep.root",