Add support for Kubernetes v1.31.0

[jvoravong]

Description:

• Add support for Kubernetes v1.31.x

[jvoravong]

Initial Test Failures only for Kubernetes 1.31.0:

=== RUN   Test_Functions/agent_logs/test_journald_sourcetypes_are_set
    functional_test.go:931: 
        	Error Trace:	/home/runner/work/splunk-otel-collector-chart/splunk-otel-collector-chart/functional_tests/functional_test.go:931
        	Error:      	[]string(nil) does not contain "kube:journald:containerd.service"
        	Test:       	Test_Functions/agent_logs/test_journald_sourcetypes_are_set
    functional_test.go:932: 
        	Error Trace:	/home/runner/work/splunk-otel-collector-chart/splunk-otel-collector-chart/functional_tests/functional_test.go:932
        	Error:      	[]string(nil) does not contain "kube:journald:kubelet.service"
        	Test:       	Test_Functions/agent_logs/test_journald_sourcetypes_are_set

=== RUN   Test_Histograms
    histogram_test.go:113: creating 7 resource(s)
=== RUN   Test_Histograms/histogram_metrics_captured
    histogram_test.go:167: 
        	Error Trace:	/home/runner/work/splunk-otel-collector-chart/splunk-otel-collector-chart/functional_tests/histogram_test.go:167
        	Error:      	Received unexpected error:
        	            	open testdata_histogram/expected/v1.31/scheduler_metrics.yaml: no such file or directory
        	Test:       	Test_Histograms/histogram_metrics_captured

[atoulme]

The first one is due to journald no longer present in the kind node image as of 1.30. We already skip tests for 1.30. See

splunk-otel-collector-chart/functional_tests/functional_test.go

Line 931 in d6a4dee

if strings.HasPrefix(os.Getenv("K8S_VERSION"), "v1.30") {

Second one requires a run collecting expected files and adding them to this PR.

[atoulme]

Closing this PR and reopening with a branch in this repository with #1483