Do not persist extensions gallery workspace variables if marketplace is disabled
MR: Pending ## Description The following discussion from !147718+ should be addressed: - [ ] https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147718#note_1855490478: > Regarding question above: > > > **question; follow-up; non-blocking** > > > > When `GL_EDITOR_ENABLE_MARKETPLACE` is false, `GL_EDITOR_EXTENSIONS_GALLERY_SERVICE_URL`, `GL_EDITOR_EXTENSIONS_GALLERY_ITEM_URL`, `GL_EDITOR_EXTENSIONS_GALLERY_RESOURCE_URL_TEMPLATE` are technically not required. They are just extra entries in the DB. Should we then add them to the workspaces_variables? Shouldn't we make it conditional? > > Yes, this is a good point. Lets make this a follow-up issue. ## Acceptance Criteria TODO: Fill out (required) - [ ] [Describe what must be achieved to complete this issue.] - [ ] [Describe another requirement needed to complete this issue.] - [ ] [Add additional acceptance criteria as needed.] ## Technical Requirements TODO: Fill out or delete (optional) [If applicable, please list out any technical requirements for this feature/enhancement.] ## Design Requirements TODO: Fill out or delete (optional) [If applicable, please provide a link to the design specifications for this feature/enhancement.] ## Impact Assessment TODO: Fill out or delete (optional) [Please describe the impact this feature/enhancement will have on the user experience and/or the product as a whole.] ## User Story TODO: Fill out or delete (optional) [Provide a user story to illustrate the use case for this feature/enhancement. Include examples to help communicate the intended functionality.] <!-- Replace with other type, e.g. bug or maintenance, if appropriate --> <!-- Replace with other subtype if appropriate --> <!-- By default, all issues start in the unprioritized status. See https://about.gitlab.com/handbook/engineering/development/dev/create/ide/#-remote-development-planning-process --> <!-- For simplicity and to avoid triage bot warnings about missing workflow labels, we will default to issues starting at the refinement phase -->
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