Remove obsolete thread pool

[rtyley]

The blocking-operations thread-pool is no longer used anywhere in the facia app, so we don't need to create it anymore (I should have listened to @ioannakok back in 2023!)

Future candidate for deletion...

The BlockingOperations class (introduced with #18359 in 2017) is currently only used in one place - the ParameterStoreService in the admin app (in service of the frontend.gutools.co.uk/config tool, introduced with #18529):

frontend/admin/app/services/ParameterStoreService.scala

Lines 13 to 21 in 217a205

	def findParameterBySubstring(substring: String): Future[Seq[String]] =
	blockingOperations.executeBlocking {
	parameterStore
	.getPath("/frontend", isRecursiveSearch = true)
	.collect {
	case (key, _) if key.contains(substring) => key
	}
	.toSeq
	}

If parameterStore.getPath() was updated to use an async SSM client, and return a Future, we could drop BlockingOperations (note that the method is also used for initialising config, which Play takes without Futures).

frontend/common/app/services/ParameterStore.scala

Line 23 in ad0b97b

def getPath(path: String, isRecursiveSearch: Boolean = false): Map[String, String] = {

[github-actions]

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From guardian/actions-riff-raff.