Rename --pruning and --keep-blocks to be more similar to one another (#11934)

* rename prunning and keep-blocks flags

* Add aliases in keep-blocks and pruning for backward compatibility

* Rename in code variables from  and  to  and

substrate/client/service/test/src/lib.rs

@@ -29,8 +29,8 @@ use sc_network::{
 use sc_service::{
 	client::Client,
 	config::{BasePath, DatabaseSource, KeystoreConfig},
-	ChainSpecExtension, Configuration, Error, GenericChainSpec, KeepBlocks, Role, RuntimeGenesis,
-	SpawnTaskHandle, TaskManager,
+	BlocksPruning, ChainSpecExtension, Configuration, Error, GenericChainSpec, Role,
+	RuntimeGenesis, SpawnTaskHandle, TaskManager,
 };
 use sc_transaction_pool_api::TransactionPool;
 use sp_api::BlockId;
@@ -234,7 +234,7 @@ fn node_config<
 		state_cache_size: 16777216,
 		state_cache_child_ratio: None,
 		state_pruning: Default::default(),
-		keep_blocks: KeepBlocks::All,
+		blocks_pruning: BlocksPruning::All,
 		chain_spec: Box::new((*spec).clone()),
 		wasm_method: sc_service::config::WasmExecutionMethod::Interpreted,
 		wasm_runtime_overrides: Default::default(),