Support *.cdn.web-ide.gitlab-static.net requests in feature specs

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MR: Pending

Description

In this MR we increased the feature spec coverage of the Web IDE, but had to disable the web_ide_extensions_marketplace feature flag. With this flag on, the test environment tries to load the VSCode Extension Host from https://*.cdn.web-ide.gitlab-static.net which blows up.

Acceptance Criteria

• The Capybara environment can handle loading the Web IDE when it reaches out to gitlab-static.net.
• The stub_feature_flags(web_ide_extensions_marketplace: false) introduced here is removed.