Bump operator from 0.71.2 to 0.80.2 in helm-charts/splunk-otel-collector/Chart.yaml

[jvoravong]

Description:

• Bumping the operator subchart version. Most of the changes in this PR were auto-generated with CI/CD, only the new test data updates were created by me manually.
• The functional tests started to fail because the included target allocator started emitting more metrics for our k8s cluster receiver integration. These new metrics are optional and not included with the default deployment of this chart, so I did not mark this change as breaking. Had to update the expected test data in expected_cluster_receiver.yaml content.
• New metrics for the target allocator include: k8s.container.cpu_limit, k8s.container.cpu_request, k8s.container.memory_limit, k8s.container.memory_request
• This PR unblocks Use Helm generated instead of cert-manager generated certs for the operator #1648