fix(bigquery): remove duplicate test dependencies from google-cloud-bigquery pom (#14587)

## Why

Every PR into `agentic-identities-bound-token` is currently failing CI
(for example #14559 and #14557, about 35 jobs each) with:

```
[ERROR] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.cloud:google-cloud-storage:jar -> duplicate declaration of version (?)
[ERROR] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.cloud:google-cloud-datacatalog:jar -> duplicate declaration of version 1.102.0-SNAPSHOT
[ERROR] The build could not read 1 project
```

`java-bigquery/google-cloud-bigquery/pom.xml` declares
`google-cloud-storage` and `google-cloud-datacatalog` twice in
`<dependencies>`. This has been the case for a while, but Maven 3.9 only
logged a `[WARNING]`. The GitHub `ubuntu-24.04` runner image `20261004`
upgraded Maven from 3.9.16 to 3.10.0, which treats it as an error, so
any job that loads the reactor now fails immediately.

## Change

Remove the second declaration of each dependency (11 lines, one file):

- `google-cloud-storage`: drops the later test-scoped entry. This is the
same change as #14586 on `main`.
- `google-cloud-datacatalog`: drops the second, identical test-scoped
entry. `main` no longer has this dependency in this pom, so #14586
doesn't need it.

## Verification

- `mvn help:effective-pom` on the module before and after: the effective
`<dependencies>` section is identical. `google-cloud-storage` stays
test-scoped because the parent's `dependencyManagement` sets
`<scope>test</scope>`, and the two datacatalog entries were identical.
- Each artifact now appears once in `<dependencies>`; the pom parses as
valid XML.

Author: macastelaz

java-bigquery/google-cloud-bigquery/pom.xml

@@ -162,11 +162,6 @@
       <scope>test</scope>
       <version>2.98.0-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-bigqueryconnection-v1:current} -->
     </dependency>
-    <dependency>
-      <groupId>com.google.cloud</groupId>
-      <artifactId>google-cloud-storage</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
@@ -192,12 +187,6 @@
       <artifactId>mockito-core</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.google.cloud</groupId>
-      <artifactId>google-cloud-datacatalog</artifactId>
-      <scope>test</scope>
-      <version>1.102.0-SNAPSHOT</version><!-- {x-version-update:google-cloud-datacatalog:current} -->
-    </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-datacatalog-v1</artifactId>