Analytics: Group and project dropdown enhancements

What does this MR do?

This MR adds a the following enhancements to the dropdowns:

Groups Dropdown

• Adds defaultGroup prop which allows passing a single group (selected by default) to the component

Projects Dropdown

• Adds defaultProjects prop which allows passing an array of projects (selected by default) to the component
• Updates the rowTemplate method by adding the is-active class to projects which are currently selected

Screenshots

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

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