fix: update the version of kentra and kentra-dashboard to 0.3.0 & 0.2.1

[Lore09]

This pull request updates the Kentra Helm chart dependencies and deployment configuration to use the latest stable versions of both the Kentra Operator and Dashboard. It also improves deployment reliability by specifying image pull policies and removing the use of the latest image tag.

Version updates:

• Updated Kentra Operator dependency version from 0.2.0 to 0.3.0 in Chart.yaml and set the image tag to 0.3.0 in values.yaml, ensuring deployments use the latest stable release. [1] [2]
• Updated Kentra Dashboard dependency version from 0.2.0 to 0.2.1 in Chart.yaml and set the image tag to 0.2.1 in values.yaml. [1] [2]

Deployment configuration improvements:

• Set imagePullPolicy: IfNotPresent for both the Kentra Operator and Dashboard images to improve deployment reliability and reduce unnecessary image pulls. [1] [2]
• Removed usage of the latest image tag in favor of explicit version tags for both images, promoting more predictable deployments. [1] [2]