Geo Replication - Rename Store/State

What does this MR do?

Currently, the UI components for Geo Replicable Items is isolated to Geo Designs Only. As we move forward, it will be easier if we have a generalized place in the UI to house different replicable data types, without spinning up additional UI components when possible.

This MR is an effort to implement the above describe changes in a readable and MVC type change.

This MR splits off from: !26410 (closed)

This MR in particular renames all the "public" store actions. ex. fetchDesigns => fetchReplicableItems.

This MR also renames the design related state objects. ex. designs => replicableItems.

GIF

Existing Functionality still works

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