Reject mysql for enterprise advanced (#31164)

* reject MySQL with the enterprise advanced license

If a user attempts to set an Enterprise Advanced License while
configured with MySQL, reject the license. This SKU is not compatible
with MYSQL.

* fix trial typo

* suppress trial banner if MySQL

* Update server/channels/app/platform/license_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix types

* suppress mysql from show start trial modal

* Skip MySQL-incompatible tests for access control and channel banner features

Skip the following tests when running with MySQL database:
- Access control policy tests (create, get, delete, check/test expressions, search, assign/unassign, get channels)
- Channel banner tests in TestPatchChannel and TestCanEditChannelBanner

These features are not supported on MySQL and the tests would fail.
Tests will continue to run normally on PostgreSQL.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Skip TestSearchChannelsForAccessControlPolicy subtest for MySQL

Add MySQL skip logic to the "SearchChannelsForAccessControlPolicy with regular user"
subtest as this access control feature is not supported on MySQL.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* reject trial license requests for MySQL

* return false on sku + mysql match, even if logger is nil

* Fix MySQL trial license tests to skip appropriately based on database driver

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

server/channels/api4/channel_test.go

@@ -810,6 +810,10 @@ func TestPatchChannel(t *testing.T) {
 	})
 
 	t.Run("Should be able to configure channel banner on a channel", func(t *testing.T) {
+		if *mainHelper.GetSQLSettings().DriverName == model.DatabaseDriverMysql {
+			t.Skip("Channel banner tests are not supported on MySQL")
+		}
+
 		client.Logout(context.Background())
 		th.LoginBasic()
 		th.App.Srv().SetLicense(model.NewTestLicenseSKU(model.LicenseShortSkuEnterpriseAdvanced))
@@ -866,6 +870,10 @@ func TestPatchChannel(t *testing.T) {
 	})
 
 	t.Run("Should be able to configure channel banner as a team admin", func(t *testing.T) {
+		if *mainHelper.GetSQLSettings().DriverName == model.DatabaseDriverMysql {
+			t.Skip("Channel banner tests are not supported on MySQL")
+		}
+
 		client.Logout(context.Background())
 		th.LoginTeamAdmin()
 		th.App.Srv().SetLicense(model.NewTestLicenseSKU(model.LicenseShortSkuEnterpriseAdvanced))
@@ -891,6 +899,10 @@ func TestPatchChannel(t *testing.T) {
 	})
 
 	t.Run("Cannot enable channel banner without configuring it", func(t *testing.T) {
+		if *mainHelper.GetSQLSettings().DriverName == model.DatabaseDriverMysql {
+			t.Skip("Channel banner tests are not supported on MySQL")
+		}
+
 		client.Logout(context.Background())
 		th.LoginBasic()
 		th.App.Srv().SetLicense(model.NewTestLicenseSKU(model.LicenseShortSkuEnterpriseAdvanced))
@@ -1010,6 +1022,10 @@ func TestCanEditChannelBanner(t *testing.T) {
 	th := Setup(t).InitBasic()
 	defer th.TearDown()
 
+	if *mainHelper.GetSQLSettings().DriverName == model.DatabaseDriverMysql {
+		t.Skip("Channel banner tests are not supported on MySQL")
+	}
+
 	t.Run("when license is nil", func(t *testing.T) {
 		channel := &model.Channel{
 			Type: model.ChannelTypeOpen,