Create a web_ide_cross_origin_extension_host just for .com

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MR: Pending

Description

Let's create a web_ide_cross_origin_extension_host feature flag that we plan to just use for .com. Once #460284 (closed) is merged we won't need to worry about this so much, but this feature flag will just be a failsafe if there's unknown blockers to that issues.

Investigation

• This might be an ops flag (If not, it might be a derisk one)
• We want this scoped to a user
• Here's where the feature flag is defined in the Web IDE https://gitlab.com/gitlab-org/gitlab-web-ide/-/blob/8b571e00a5f3b35666adf33798e3e6dca540f5d4/packages/web-ide-types/src/features.ts#L2
• We want a Rails FF that is pushed to the FE and given to the Web IDE config