Removed :monaco_blobs feature flag

What does this MR do?

The :monaco_blobs feature flag that introduced Editor Lite to the single-file editor, has been enabled by default in %13.3. This MR completely removes the flag itself, conditions based on it, and its references.

Screenshots

No visual changes:

Before	After

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry - db1959ca
• [-] 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

Related to #198609 (closed)