feat: migrate resource processors to transform processors and ensure attributes with empty values are also enriched

[TeodorSAP]

Description

Changes proposed in this pull request (what was done and why):

• Migrate processor: resource/insert-cluster-attributes -> transform/insert-cluster-attributes
• Migrate processor: resource/drop-kyma-attributes -> transform/drop-kyma-attributes
• Migrate processor: resource/drop-service-name -> transform/drop-service-name
• Migrate processor: resource/drop-skip-enrichment-attribute -> transform/drop-skip-enrichment-attribute
• Migrate processor: resource/set-kyma-input-name-istio -> transform/set-kyma-input-name-istio
• Migrate processor: resource/set-kyma-input-name-prometheus -> transform/set-kyma-input-name-prometheus
• Migrate processor: resource/set-kyma-input-name-runtime -> transform/set-kyma-input-name-runtime
• Migrate processor: resource/set-kyma-input-name-kyma -> transform/set-kyma-input-name-kyma
• Migrate processor: resource/set-kyma-input-name-otlp -> transform/set-kyma-input-name-otlp
• Implement UT & E2E tests for covering empty value attributes edge-case
• TODO: Find a solution for the service.name and k8sattributes empty values problem
• Remove resource processor definitions and mentions

Changes refer to particular issues, PRs or documents:

• Resolves Enrich data for empty attributes #1412

Traceability

• The PR is linked to a GitHub issue.
• The follow-up issues (if any) are linked in the Related Issues section.
• If the change is user-facing, the documentation has been adjusted.
• If a CRD is changed, the corresponding Busola ConfigMap has been adjusted.
• The feature is unit-tested.
• The feature is e2e-tested.