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What does this MR do?

Introduces linking to a file(s) in Editor Lite. The functionality is available in all Editor Lite instances using the base extension (both single-file editor and WebIDE), or any of its derivatives.

The URL hash schema for this feature:

#L{N1}-{N2}

where {N1} and {N2} are the digits with the following meaning:

Param	Is required?	Description
{N1}	YES	The number of the first line to highlight.
{N1}	NO	The number of the last line to be included in highlighting.

The first line to be highlighted is centered on the screen for the convenience of the users.

Screenshots (strongly suggested)

	Linking to a single line	Linking to multiple lines
Single-file editor
WebIDE
Pipeline Editor

This MR also introduces the "link" icon shown whenever hovering over a line number in the editor:

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• 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

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #21762 (closed)