message: Update wording in changeset
diff: '@backstage/test-utils-core': patch
  ---
  -Migrates all utility methods from `test-utils-core` into `test-utils`.
  -The entire `@backstage/test-utils-core` is considered deprecated. The package will be removed in a few weeks time.
  -This should have almost no impact since this package is primarily used internally by core packages.
  +Migrates all utility methods from `test-utils-core` into `test-utils` and delete exports from the old package.
  +This should have no impact since this package is considered internal and have no usages outside core packages.
  Notable changes are that the testing tool `msw.setupDefaultHandlers()` have been deprecated in favour of `setupRequestMockHandlers()`.
  