chore(ci): remove baremetal cluster tests

[universal-itengineer]

Description

Remove obsolete baremetal nightly E2E GitHub Actions workflows from CI.

Why do we need it, and what problem does it solve?

The repository still contains nightly workflows for baremetal E2E runs and their report aggregation, although these jobs are no longer needed. Keeping them in the CI configuration adds maintenance overhead, clutters the Actions list, and may trigger outdated scheduled jobs or leave confusing dead configuration behind.

This change cleans up the CI setup by removing the unused baremetal nightly workflows.

What is the expected result?

1. Open GitHub Actions for the repository.
2. Verify that the removed baremetal nightly workflows are no longer present in the workflow list.
3. Confirm the repository no longer contains the deleted workflow files.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: ci
type: chore
summary: "Remove obsolete baremetal nightly E2E workflows and report job."
impact_level: low