Order projects by name in the "Move issue" dropdown

What does this MR do?

It orders projects by its name when listing them in the dropdown. Because we return only first 20 projects in the list. This assures that exact matches are prioritized in the list of returned projects which is important because we don't support pagination for autocompletion (probably for performance reasons) and when we ordered results by ID, exact matches might not be included in the list.

It also removes pagination from backend code (offset_id parameter) because this is not used anywhere. It seems frontend dropped usage of this parameter in commit 90c60138

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/59387

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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

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