Standardize migration tests to not include prepended Migrate

@BramDriesen, this quick patch looks good, just a few things. Most of the errors reflect that I should have added more detail to the Issue Summary, sorry about that.

Please make the patch with, 'git diff -M', so the renames are recognized as renames and the patch size is reduced. That will make it a lot easier to review. It's mentioned in the Advanced patch contributor guide in point 6 under section "Creating patches via topic branch".

1. +++ b/tests/src/Kernel/MigrateCommerceMigrateTestTrait.php
   @@ -0,0 +1,443 @@
   +  ¶
   

   Delete trailing whitespace.

2. +++ b/tests/src/Kernel/MigrateCommerceMigrationLabelExistTest.php
   @@ -0,0 +1,65 @@
   +class MigrateCommerceMigrationLabelExistTest extends MigrateDrupalTestBase {
   

   Ah, this doesn't need to be renamed, it isn't a migration test. It just creates the migrations and then asserts that the label exists.

3. +++ b/tests/src/Kernel/MigrateCommerceMigrationProvidersExistTest.php
   @@ -0,0 +1,79 @@
   +class MigrateCommerceMigrationProvidersExistTest extends MigrateDrupalTestBase {
   

   Same here. This isn't a migration test and shouldn't be renamed.

4. +++ b/modules/woocommerce/tests/src/Kernel/MigrateWoocommerceTestBase.php
   @@ -0,0 +1,49 @@
   +abstract class MigrateWoocommerceTestBase extends MigrateTestBase {
   

   Sorry, you wouldn't know this but this shouldn't be renamed either. The woocommerce code won't work as it is and will be removed soonish.

5. +++ b/tests/src/Kernel/MigrateCommerceMigrateTestTrait.php
   @@ -0,0 +1,443 @@
   +trait MigrateCommerceMigrateTestTrait {
   

   Same here. This shouldn't be renamed.

The IS has been updated to identify the file names that are not to be renamed.

Great! Just one more thing, the plugin tests don't need a rename.

+++ b/modules/ubercart/tests/src/Kernel/Migrate/d7/MigrateUbercart7TestBase.php
similarity index 97%
rename from modules/ubercart/tests/src/Kernel/Plugin/migrate/source/d6/BillingProfileTest.php

+++ b/modules/ubercart/tests/src/Kernel/Plugin/migrate/source/d6/MigrateBillingProfileTest.php
similarity index 97%
rename from modules/ubercart/tests/src/Kernel/Plugin/migrate/source/d6/OrderProductCurrencyTest.php

+++ b/modules/ubercart/tests/src/Kernel/Plugin/migrate/source/d6/MigrateOrderProductCurrencyTest.php
similarity index 97%
rename from modules/ubercart/tests/src/Kernel/Plugin/migrate/source/d6/OrderProductNoCurrencyTest.php

These don't need a rename because they are not full migration tests. They test a source plugin.

Yea, I reckon you are right. It is a personal preference.

Thanks everyone!
@BramDriesen thanks for persisting with this despite my ongoing changes to the IS.