Enable :profile_admin feature flag (#17187)

This makes profile fields available for all forems.

There is a follow up task to remove the conditionals around this (and
remove the flag).

lib/data_update_scripts/20220408154416_enable_profile_admin_feature.rb

@@ -0,0 +1,7 @@
+module DataUpdateScripts
+  class EnableProfileAdminFeature
+    def run
+      FeatureFlag.enable(:profile_admin)
+    end
+  end
+end

spec/lib/data_update_scripts/enable_profile_admin_feature_spec.rb

@@ -0,0 +1,32 @@
+require "rails_helper"
+require Rails.root.join(
+  "lib/data_update_scripts/20220408154416_enable_profile_admin_feature.rb",
+)
+
+describe DataUpdateScripts::EnableProfileAdminFeature do
+  after do
+    FeatureFlag.remove(:profile_admin)
+  end
+
+  it "enables the :profile_admin flag" do
+    expect do
+      described_class.new.run
+    end.to change { FeatureFlag.enabled?(:profile_admin) }.from(false).to(true)
+  end
+
+  it "works if the flag is already available" do
+    FeatureFlag.add(:profile_admin)
+
+    expect do
+      described_class.new.run
+    end.not_to change { FeatureFlag.exist?(:profile_admin) }
+  end
+
+  it "works if the flag is already enabled" do
+    FeatureFlag.enable(:profile_admin)
+
+    expect do
+      described_class.new.run
+    end.not_to change { FeatureFlag.enabled?(:profile_admin) }
+  end
+end