Remove fuzzy search for emoji

What does this MR do?

This MR is based on this community contribution: !45603 (closed). The changelog attributes the community contributor !45603 (comment 481479396). Please refer to the mentioned MR for more context.

• Removes fuzzy search for emoji. This MR refactors and partially reverts the changes made in !42669 (merged).

Will resolve #297490 (closed), #268208 (closed), #283826 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
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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
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Security

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• 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
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