fix: add per-service apiVersion to gapic_metadata (#788)

Author: noahdietz

generator/gapic-generator-typescript/baselines/showcase-esm/esm/src/v1beta1/gapic_metadata.json.baseline

@@ -120,6 +120,7 @@
       }
     },
     "Echo": {
+      "apiVersion": "v1_20240408",
       "clients": {
         "grpc": {
           "libraryClient": "EchoClient",

generator/gapic-generator-typescript/baselines/showcase/src/v1beta1/gapic_metadata.json.baseline

@@ -120,6 +120,7 @@
       }
     },
     "Echo": {
+      "apiVersion": "v1_20240408",
       "clients": {
         "grpc": {
           "libraryClient": "EchoClient",

generator/gapic-generator-typescript/templates/cjs/typescript_gapic_metadata/src/$version/gapic_metadata.json.njk

@@ -43,6 +43,9 @@ limitations under the License.
 {%- for service in api.services -%}
     {{- serviceJoiner() -}}
     "{{ service.name }}": {
+      {%- if service.apiVersion -%}
+      "apiVersion": "{{ service.apiVersion }}",
+      {%- endif -%}
 {#- TODO(@alexander-fenster): replace hardcoded transports ("grpc", etc.) with an iteration. -#}
       "clients": {
         "grpc": {

generator/gapic-generator-typescript/templates/esm/typescript_gapic_metadata/esm/src/$version/gapic_metadata.json.njk

@@ -43,6 +43,9 @@ limitations under the License.
 {%- for service in api.services -%}
     {{- serviceJoiner() -}}
     "{{ service.name }}": {
+      {%- if service.apiVersion -%}
+      "apiVersion": "{{ service.apiVersion }}",
+      {%- endif -%}
 {#- TODO(@alexander-fenster): replace hardcoded transports ("grpc", etc.) with an iteration. -#}
       "clients": {
         "grpc": {