[SPARK-31881][K8S][TESTS][FOLLOWUP] Activate hadoop-2.7 by default in K8S IT

### What changes were proposed in this pull request?

This PR aims to activate `hadoop-2.7` profile by default in Kubernetes IT module.

### Why are the changes needed?

While SPARK-31881 added Hadoop 3.2 support, one default test dependency was moved to `hadoop-2.7` profile. It works when we give one of `hadoop-2.7` and `hadoop-3.2`, but it fails when we don't give any profile.

**BEFORE**
```
$ mvn test-compile -pl resource-managers/kubernetes/integration-tests -Pkubernetes-integration-tests
...
[ERROR] [Error] /APACHE/spark-merge/resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/DepsTestsSuite.scala:23:
object amazonaws is not a member of package com
```

**AFTER**
```
$ mvn test-compile -pl resource-managers/kubernetes/integration-tests -Pkubernetes-integration-tests
..
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
```

The default activated profile will be override when we give `hadoop-3.2`.
```
$ mvn help:active-profiles -Pkubernetes-integration-tests
...
Active Profiles for Project 'org.apache.spark:spark-kubernetes-integration-tests_2.12:jar:3.1.0-SNAPSHOT':

The following profiles are active:

 - hadoop-2.7 (source: org.apache.spark:spark-kubernetes-integration-tests_2.12:3.1.0-SNAPSHOT)
 - kubernetes-integration-tests (source: org.apache.spark:spark-parent_2.12:3.1.0-SNAPSHOT)
 - test-java-home (source: org.apache.spark:spark-parent_2.12:3.1.0-SNAPSHOT)
```
```
$ mvn help:active-profiles -Pkubernetes-integration-tests -Phadoop-3.2
...
Active Profiles for Project 'org.apache.spark:spark-kubernetes-integration-tests_2.12:jar:3.1.0-SNAPSHOT':

The following profiles are active:

 - hadoop-3.2 (source: org.apache.spark:spark-kubernetes-integration-tests_2.12:3.1.0-SNAPSHOT)
 - hadoop-3.2 (source: org.apache.spark:spark-parent_2.12:3.1.0-SNAPSHOT)
 - kubernetes-integration-tests (source: org.apache.spark:spark-parent_2.12:3.1.0-SNAPSHOT)
 - test-java-home (source: org.apache.spark:spark-parent_2.12:3.1.0-SNAPSHOT)
```

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass the Jenkins UT and IT.

Currently, all Jenkins build and tests (UT & IT) passes without this patch. This should be tested manually with the above command.

`hadoop-3.2` K8s IT also passed like the following.
```
KubernetesSuite:
- Run SparkPi with no resources
- Run SparkPi with a very long application name.
- Use SparkLauncher.NO_RESOURCE
- Run SparkPi with a master URL without a scheme.
- Run SparkPi with an argument.
- Run SparkPi with custom labels, annotations, and environment variables.
- All pods have the same service account by default
- Run extraJVMOptions check on driver
- Run SparkRemoteFileTest using a remote data file
- Run SparkPi with env and mount secrets.
- Run PySpark on simple pi.py example
- Run PySpark with Python2 to test a pyfiles example
- Run PySpark with Python3 to test a pyfiles example
- Run PySpark with memory customization
- Run in client mode.
- Start pod creation from template
- PVs with local storage
- Launcher client dependencies
- Test basic decommissioning
Run completed in 8 minutes, 33 seconds.
Total number of tests run: 19
Suites: completed 2, aborted 0
Tests: succeeded 19, failed 0, canceled 0, ignored 0, pending 0
All tests passed.
```

Closes apache#28716 from dongjoon-hyun/SPARK-31881-2.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

resource-managers/kubernetes/integration-tests/pom.xml

@@ -186,6 +186,9 @@
   <profiles>
     <profile>
       <id>hadoop-2.7</id>
+      <activation>
+        <activeByDefault>true</activeByDefault>
+      </activation>
       <dependencies>
         <dependency>
           <groupId>com.amazonaws</groupId>