chore: rm template from issue_tracker in config and repometadata (#12798)

Remove unnecessary `&template=0` from generation_config.yaml and
.repo-metadata.json. This is in attempt to remove non-ASCII characters
to minimize generation diff for librarian migration.

Fix googleapis/librarian#5371

Author: zhumin8

generation_config.yaml

@@ -235,7 +235,7 @@ libraries:
   library_name: asset
   release_level: stable
   api_reference: https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview
-  issue_tracker: https://issuetracker.google.com/issues/new?component=187210&template=0
+  issue_tracker: https://issuetracker.google.com/issues/new?component=187210
   GAPICs:
   - proto_path: google/cloud/asset/v1
   - proto_path: google/cloud/asset/v1p1beta1
@@ -1331,7 +1331,7 @@ libraries:
     accounts.
   release_level: stable
   requires_billing: false
-  issue_tracker: https://issuetracker.google.com/issues/new?component=187161&template=0
+  issue_tracker: https://issuetracker.google.com/issues/new?component=187161
   GAPICs:
   - proto_path: google/iam/credentials/v1
 - api_shortname: iap

java-asset/.repo-metadata.json

@@ -14,5 +14,5 @@
   "library_type": "GAPIC_AUTO",
   "requires_billing": true,
   "api_reference": "https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview",
-  "issue_tracker": "https://issuetracker.google.com/issues/new?component=187210&template=0"
+  "issue_tracker": "https://issuetracker.google.com/issues/new?component=187210"
 }

java-iamcredentials/.repo-metadata.json

@@ -13,5 +13,5 @@
   "api_id": "iamcredentials.googleapis.com",
   "library_type": "GAPIC_AUTO",
   "requires_billing": false,
-  "issue_tracker": "https://issuetracker.google.com/issues/new?component=187161&template=0"
+  "issue_tracker": "https://issuetracker.google.com/issues/new?component=187161"
 }

sdk-platform-java/hermetic_build/README.md

@@ -192,7 +192,7 @@ libraries:
     client_documentation: "https://cloud.google.com/java/docs/reference/google-cloud-asset/latest/overview"
     distribution_name: "com.google.cloud:google-cloud-asset"
     release_level: "stable"
-    issue_tracker: "https://issuetracker.google.com/issues/new?component=187210&template=0"
+    issue_tracker: "https://issuetracker.google.com/issues/new?component=187210"
     api_reference: "https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview"
     GAPICs:
       - proto_path: google/cloud/asset/v1