[DOCS-14086] Add US2-FED (gov2) region to integration docs (DataDog#23604)

* Add US2-FED (gov2) region to integration site-region blocks

Add gov2 to the comma-separated region lists in site-region shortcode
blocks across 4 integration README files (amazon_app_mesh, ecs_fargate,
flink, openai). US2-FED is a new Datadog GovCloud data center (IL5).

Related: DataDog/documentation#36153 (DOCS-14086)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Revert ecs_fargate gov2 changes pending proper endpoint split

The ecs_fargate README has gov-specific blocks with hardcoded
ddog-gov.datadoghq.com intake hosts. Simply adding gov2 to the
comma list shows US2-FED readers the wrong host. A proper fix
requires dedicated gov2 blocks with us2.ddog-gov.com endpoints
across multiple code snippets. Backing out for now to avoid
shipping incorrect config to US2-FED users.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hestonhoffman

amazon_app_mesh/README.md

@@ -67,7 +67,7 @@ Log collection is not supported for this site.
 partial -->
 
 <!-- partial
-{{< site-region region="us,eu,gov" >}}
+{{< site-region region="us,eu,gov,gov2" >}}
 
 To enable log collection, update the Agent's DaemonSet with the dedicated [Kubernetes log collection instructions][1].
 
@@ -127,7 +127,7 @@ Log collection is not supported for this site.
 partial -->
 
 <!-- partial
-{{< site-region region="us,eu,gov" >}}
+{{< site-region region="us,eu,gov,gov2" >}}
 
 Enable log collection with the instructions in the [ECS Fargate integration documentation][1].
 
@@ -178,7 +178,7 @@ Log collection is not supported for this site.
 partial -->
 
 <!-- partial
-{{< site-region region="us,eu,gov" >}}
+{{< site-region region="us,eu,gov,gov2" >}}
 
 Enable log collection with the instructions in the [ECS integration documentation][1].
 

flink/README.md

@@ -19,7 +19,7 @@ No additional installation is needed on your server.
 #### Metric collection
 
 <!-- partial
-{{< site-region region="gov" >}}
+{{< site-region region="gov,gov2" >}}
 1. Configure the [StatsD reporter][14] in Flink.
    In your `<FLINK_HOME>/conf/flink-conf.yaml`, add these lines:
    ```yaml

openai/README.md

@@ -211,7 +211,7 @@ This will display detailed information about any errors or issues with tracing.
 **Notes**:
 
 <!-- partial
-{{% site-region region="us3,us5,eu,gov,ap1" %}}
+{{% site-region region="us3,us5,eu,gov,gov2,ap1" %}}
 - Non-US1 customers must set `DD_SITE` on the application command to the correct Datadog site parameter as specified in the table in the <a href="https://docs.datadoghq.com/getting_started/site/#access-the-datadog-site">Datadog Site</a> page (for example, `datadoghq.eu` for EU1 customers).{{% /site-region %}}
 partial -->
 
@@ -453,7 +453,7 @@ Validate that the APM Node.js library can communicate with your Agent by examini
 **Notes**:
 
 <!-- partial
-{{% site-region region="us3,us5,eu,gov,ap1" %}}
+{{% site-region region="us3,us5,eu,gov,gov2,ap1" %}}
 - Non-US1 customers must set `DD_SITE` on the application command to the correct Datadog site parameter as specified in the table in the <a href="https://docs.datadoghq.com/getting_started/site/#access-the-datadog-site">Datadog Site</a> page (for example, `datadoghq.eu` for EU1 customers).{{% /site-region %}}
 partial -->