Fix Kubernetes applications template issues

What does this MR do?

This MR fixes a few issues with the Kubernetes applications template:

1. Removed elasticsearchLogo, jeagerLogo, and meltanoLogo because they're unused. The images themselves were not deleted, just the usages of them.
2. Moved some data properties that are static and don't need reactivity, to .$options properties.
3. Removed some unused computed properties.
4. Improved some if-else logic in the template.
5. Added IDs to <input>s that have labels with a for attribute.

Screenshots

Page looks the same, changes are behind-the-scenes only

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• 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
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done