Remove weight from incidents sidebar

What does this MR do?

A tiny MVC for #229971 (closed) where we remove the weight feature from the issues sidebar for incident types.

This MR also fixes a ~bug where the Weight input field was shown on the "New issue" form in case of unlicensed Enterprise Edition.

Screenshots

Sidebar

Incident	Issue

Weight input field bug fix

Scenario	master	This MR
EE licesened	✔	✔
EE not licesened	🚫	✔

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

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

Contributes to #229971 (closed)