Replace 'one-off' by 'bespoke' (#760)

* Replace 'one-off' by 'bespoke'

Since the documentation has changed the terminology from data test to bespoke test and uses bespoke at the main heading in the main Tests docs (https://docs.getdbt.com/docs/building-a-dbt-project/tests#bespoke-tests), it is confusing to use `one-off test` here. I'm therefore proposing to update this to use `Bespoke` here as well.

* Apply suggestions from code review

Co-authored-by: Leona B. Campbell <3880403+runleonarun@users.noreply.github.com>

website/docs/reference/resource-configs/store_failures.md

@@ -24,7 +24,7 @@ This logic is encoded in the [`should_store_failures()`](https://github.com/fish
   defaultValue="specific"
   values={[
     { label: 'Specific test', value: 'specific', },
-    { label: 'One-off test', value: 'one_off', },
+    { label: 'Singular test', value: 'singular', },
     { label: 'Generic test block', value: 'generic', },
     { label: 'Project level', value: 'project', },
   ]
@@ -56,9 +56,9 @@ models:
 
 </TabItem>
 
-<TabItem value="one_off">
+<TabItem value="singular">
 
-Configure a one-off (data) test:
+Configure a singular (data) test:
 
 <File name='tests/<filename>.sql'>