Identity UI: Input forms' `form-floating` broken styles fixed. (#42075)

.../src/Areas/Identity/Pages/V5/Account/ExternalLogin.cshtml

...ntity/UI/src/Areas/Identity/Pages/V5/Account/Login.cshtml

...I/src/Areas/Identity/Pages/V5/Account/LoginWith2fa.cshtml

...as/Identity/Pages/V5/Account/LoginWithRecoveryCode.cshtml

...as/Identity/Pages/V5/Account/Manage/ChangePassword.cshtml

...dentity/Pages/V5/Account/Manage/DeletePersonalData.cshtml

...I/src/Areas/Identity/Pages/V5/Account/Manage/Email.cshtml

...entity/Pages/V5/Account/Manage/EnableAuthenticator.cshtml

...I/src/Areas/Identity/Pages/V5/Account/Manage/Index.cshtml

...Areas/Identity/Pages/V5/Account/Manage/SetPassword.cshtml

.../src/Areas/Identity/Pages/V5/Account/ResetPassword.cshtml