Add new link to "Pod logs" in sidebar and create empty state page when no environment is available

What does this MR do?

Currently the pod logs environment is hard to reach. This MR creates a new route to link to a default environment and adds a link to it in the sidebar.

Define a new route

Defines a new route /root/autodevops-deploy/environments/logs that redirects to /root/autodevops-deploy/environments/<default-env>/logs

Add new menu item in the side bar

sidebar active menu	sidebar menu	empty state (note the centered text)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• follow-up review issue created at #35401 (closed)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Related to #24088 (closed)