[PM-13346] Email notification impacts (#5027)

* Changes for the email notification

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Remove Get SponsoringSponsoredEmailAsync method

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Remove unused policyRepository referrence

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Removed unused OrganizationSponsorshipResponse

* Rollback unrelated code changes

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Resolve the failing test

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Method to get policy status without login

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Refactor the email notification

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Remove unused property

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Remove unused property

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Fix line spacing

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* remove extra line

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Refactor base on the pr review

* Remove the unused interface

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

* Add changes for error message for disable policy

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

---------

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

src/Core/Constants.cs

@@ -154,6 +154,7 @@ public static class FeatureFlagKeys
     public const string NewDeviceVerificationPermanentDismiss = "new-device-permanent-dismiss";
     public const string SecurityTasks = "security-tasks";
     public const string PM14401_ScaleMSPOnClientOrganizationUpdate = "PM-14401-scale-msp-on-client-organization-update";
+    public const string DisableFreeFamiliesSponsorship = "PM-12274-disable-free-families-sponsorship";
 
     public static List<string> GetAllKeys()
     {