[Helm] Modernize Labels

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/skywalking/issues?q=is%3Aissue) and found no similar feature requirement.

### Description

SkyWalking and BanyanDB Helm Chart adhere to a legacy label style from Helm 2. We should update them by referencing https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/.

### Use case

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request to implement this on your own?

- [ ] Yes I am willing to submit a pull request on my own!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Inspect the SkyWalking and BanyanDB Helm charts and compare their current labels with Kubernetes common-label guidance. Update the chart label definitions to the modern style, then render or validate both charts to confirm the expected labels are present.

Written by the indexing model from the issue text.