[Email/RetPol] Harden retention policy for Email Inbox setup. (#2324)

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#### Summary <!-- Provide a general summary of your changes -->
During upgrade and data migration, for some environments, they are
running into an error that the Email Inbox is not in the allowed list of
tables.

This PR fixes it by combining both upgrade functions into one, and
exiting if the table is not in the list of allowed tables.

#### Work Item(s) <!-- Add the issue number here after the #. The issue
needs to be open and approved. Submitting PRs with no linked issues or
unapproved issues is highly discouraged. -->
Fixes
[AB#556484](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/556484)

src/System Application/App/Email/src/EmailInstaller.Codeunit.al

@@ -31,7 +31,6 @@ codeunit 1596 "Email Installer"
     procedure AddRetentionPolicyAllowedTables()
     begin
         AddRetentionPolicyAllowedTables(false);
-        AddRetentionPolicyEmailInboxAllowedTable(false);
         CreateRetentionPolicySetup(false);
     end;
 
@@ -53,26 +52,11 @@ codeunit 1596 "Email Installer"
             UpgradeTag.SetUpgradeTag(GetEmailTablesAddedToAllowedListUpgradeTag());
     end;
 
-    procedure AddRetentionPolicyEmailInboxAllowedTable(ForceUpdate: Boolean)
-    var
-        Field: Record Field;
-        RetenPolAllowedTables: Codeunit "Reten. Pol. Allowed Tables";
-        UpgradeTag: Codeunit "Upgrade Tag";
-        IsInitialSetup: Boolean;
-    begin
-        IsInitialSetup := not UpgradeTag.HasUpgradeTag(GetEmailInboxAddedToAllowedListUpgradeTag());
-        if not (IsInitialSetup or ForceUpdate) then
-            exit;
-
-        RetenPolAllowedTables.AddAllowedTable(Database::"Email Inbox", Field.FieldNo(SystemCreatedAt), 2);
-
-        if IsInitialSetup then
-            UpgradeTag.SetUpgradeTag(GetEmailInboxAddedToAllowedListUpgradeTag());
-    end;
-
     procedure CreateRetentionPolicySetup(ForceUpdate: Boolean)
     var
+        Field: Record Field;
         RetentionPolicySetup: Record "Retention Policy Setup";
+        RetenPolAllowedTables: Codeunit "Reten. Pol. Allowed Tables";
         RetentionPolicySetupCU: Codeunit "Retention Policy Setup";
         UpgradeTag: Codeunit "Upgrade Tag";
         DateFormula: DateFormula;
@@ -82,6 +66,9 @@ codeunit 1596 "Email Installer"
         if not (IsInitialSetup or ForceUpdate) then
             exit;
 
+        if not RetenPolAllowedTables.AddAllowedTable(Database::"Email Inbox", Field.FieldNo(SystemCreatedAt), 2) then
+            exit;
+
         RetentionPolicySetup.SetRange("Table Id", Database::"Email Inbox");
         if not RetentionPolicySetup.IsEmpty() then
             exit;
@@ -103,11 +90,6 @@ codeunit 1596 "Email Installer"
         exit('MS-373161-EmailLogEntryAdded-20201005');
     end;
 
-    local procedure GetEmailInboxAddedToAllowedListUpgradeTag(): Code[250]
-    begin
-        exit('MS-539754-EmailInboxAdded-20240827');
-    end;
-
     local procedure GetEmailInboxPolicyAddedToAllowedListUpgradeTag(): Code[250]
     begin
         exit('MS-539754-EmailInboxPolicyAdded-20240827');
@@ -117,7 +99,6 @@ codeunit 1596 "Email Installer"
     local procedure AddAllowedTablesOnRefreshAllowedTables()
     begin
         AddRetentionPolicyAllowedTables(true);
-        AddRetentionPolicyEmailInboxAllowedTable(true);
         CreateRetentionPolicySetup(true);
     end;