Revert "revert single implicit asset job (#23607)" (#23777)

This reverts commit 35f00aa.

## Summary & Motivation

We had reverted the single implicit asset job stack after discovering
that it caused problems in the UI. Those problems are fixed by the stack
ending in [this GraphQL
change](#23494) and [this
frontend change](#23747).

So this unreverts. It shouldn't be merged until that frontend change
makes it in.

## How I Tested These Changes

examples/docs_snippets/docs_snippets_tests/guides_tests/dagster_pipes_tests/test_databricks.py

@@ -35,9 +35,7 @@ def test_databricks_asset(databricks_client, capsys):
             script_file=script_file,
             dbfs_path="dbfs:/my_python_script.py",
         ) as script_file:
-            job_def = databricks_asset_defs.get_implicit_job_def_for_assets(
-                [AssetKey("databricks_asset")],
-            )
+            job_def = databricks_asset_defs.get_implicit_global_asset_job_def()
             assert job_def
             result = job_def.execute_in_process()
             assert result.success

python_modules/dagster-graphql/dagster_graphql/schema/asset_graph.py

@@ -7,7 +7,7 @@
     _check as check,
 )
 from dagster._core.definitions.asset_graph_differ import AssetDefinitionChangeType, AssetGraphDiffer
-from dagster._core.definitions.asset_job import ASSET_BASE_JOB_PREFIX
+from dagster._core.definitions.asset_job import IMPLICIT_ASSET_JOB_NAME
 from dagster._core.definitions.data_time import CachingDataTimeResolver
 from dagster._core.definitions.data_version import (
     NULL_DATA_VERSION,
@@ -951,7 +951,7 @@ def resolve_targetingInstigators(self, graphene_info) -> Sequence[GrapheneSensor
         job_names = {
             job_name
             for job_name in self._external_asset_node.job_names
-            if not job_name.startswith(ASSET_BASE_JOB_PREFIX)
+            if not job_name == IMPLICIT_ASSET_JOB_NAME
         }
 
         results = []