Resolve "Search Group/Category name change"

Problem

There are multiple forms of search in GitLab:

• Global search from the /search endpoint
• Filter bar searches (/issues, /merge_requests, /epics) (Part of Plan)
• Search within dropdowns (milestone, users, right side of issues) (Part of the Global FE)
• Elasticsearch Logging (Part of APM)

Currently the Search group is only responsible for the Global /search endpoint - this means when users looking for various responsible groups are confused by a broadly termed "Search Group".

Proposal

This MR renames the following major aspects:

• Group: Search to Global Search
• Category: Search to Global Search

The non-Elasticsearch feature of this name will be referred to as Basic Global Search in documentation.

What is not being changed?

Currently the global search featured powered by Elasticsearch is named Advanced Global Search. As it is a more advanced version of the existing global search this will remain the feature name. An issue to ensure consistency across the application and documentation will be worked within the group.

Approvals

Merge requests with changes to stages and groups and significant changes to categories need to be created, approved, and/or merged by each of the below:

• EVP of Product
• VP of Product Strategy
• The Product Director relevant to the stage group(s)
• The Engineering Director relevant to the stage group(s)
• CEO

The following people need to be on the merge request so they stay informed:

• EVP of Engineering @edjdev
• Senior Director of Development @clefelhocz1
• Director of Quality @meks
• The Product Marketing Manager relevant to the stage group(s) @johnjeremiah