arb/nitro: drop obsolete --node.da-provider.* and DA inbox/parent-url flags

These flags were removed in Nitro v3.10 and cause Fatal config errors on
startup. Affected chains use AnyTrust DAS via REST aggregator without a
separate relay (orbit-no-relay branch):
- alephzero (mainnet+sepolia)
- connext-sepolia
- everclear-mainnet
- opencampuscodex-sepolia
- playblock-mainnet
- plume (mainnet+testnet)
- real-mainnet

The parent-chain node URL and sequencer-inbox-address are now auto-derived
from --parent-chain.connection.url. The --node.da-provider.* flag family is
gone entirely.

Verified live on rpc-de-13 (everclear): container Up, REST aggregator URL
accepted, head block loaded, RPC listening.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

arb/nitro/plume-testnet-nitro-pruned-pebble-path.yml

@@ -67,12 +67,9 @@ services:
       - --metrics-server.addr=0.0.0.0
       - --metrics-server.port=6070
       - --node.batch-poster.enable=false
-      - --node.da-provider.enable=false
       - --node.data-availability.enable=true
-      - --node.data-availability.parent-chain-node-url=${ETHEREUM_SEPOLIA_EXECUTION_RPC}
       - --node.data-availability.rest-aggregator.enable=true
       - --node.data-availability.rest-aggregator.urls=https://das-plume-testnet-1.t.conduit.xyz
-      - --node.data-availability.sequencer-inbox-address=0xbCa991f1831bE1F1E7e5576d5F84A645e70F3E4d
       - --node.feed.input.url=wss://relay-plume-testnet-1.t.conduit.xyz
       - --node.sequencer=false
       - --node.staker.enable=false