[GoodID Upgrade] Feature Flag to control release

[decentralauren]

Is your feature request related to a problem? Please describe.
Need to be able to stage release of the GoodID upgrade, specifically:

• Round 1: By whitelisted wallet address
• Round 2: By country

Describe the solution you'd like
A feature flag managed in post-hog to control roll-out of the GoodID upgrade and GoodOffers, specifically to facilitate testing. This can copy the feature flag used for the Welcome Offer from GW1>GW2

[L03TJ3]

Moved issue because the feature-flag handling for this can/should be done on client-side

[L03TJ3]

For dev UAT we don't need a feature flag, the goodid offers are just enabled on dev by default.

Still need to add before release to production