[PS-721] Left align all email template text (#2033)

Make all email template text left-aligned, excluding call-to-actions buttons which should remain centered

In the emails needing updates, remove font styling from HTML tags other than <td> and <p>

Add an additional margin above and below each call-to-action button

For emails that include only the “ignore” warning below the call-to-action button move the warning up, so the button is the last item displayed

Fix the unit test that allows developers to locally generate test emails

test/Core.Test/Services/HandlebarsMailServiceTests.cs

@@ -117,6 +117,9 @@ namespace Bit.Core.Test.Services
                 { ("familyOrgName", typeof(string)), "Test Org Name" },
                 { ("existingAccount", typeof(bool)), true },
                 { ("sponsorshipEndDate", typeof(DateTime)), DateTime.UtcNow.AddDays(1)},
+                { ("sponsorOrgName", typeof(string)), "Sponsor Test Org Name" },
+                { ("expirationDate", typeof(DateTime)), DateTime.Now.AddDays(3) },
+                { ("utcNow", typeof(DateTime)), DateTime.UtcNow },
             };
 
             var globalSettings = new GlobalSettings