Group:Editor Evaluate feature tiers following buyer tier model

In #270 (closed), we discussed realigning our EE feature set with our buyer tier model.

Buyers: IC (Individual Contributor), M (Manager), D (Director), E (Executive)

Feature	Current Tier	Target Buyer Persona	Proposed Action	Public Issues
Web Terminal for Web IDE	Ultimate	IC	Move to Core	Rationale: The Web IDE is targeted at individual contributors who would be looking at ways to contribute. This features are part of the core of an IDE offering.
File Syncing to Web Terminal	Ultimate	IC	Move to Core	Rationale: The Web IDE is targeted at individual contributors who would be looking at ways to contribute. This features are part of the core of an IDE offering.
Elasticsearch	Starter	IC	Leave in Place	Rationale: The experience around Elasticsearch is not where it needs to be to move down in tier to Core. Documented extensively in https://gitlab.com/gitlab-org/gitlab-ce/issues/61886