Rename to TokenLimitEnforcementTest to fix warning

[maartenvanvliet]

It yielded a warning in elixir 1.19

Generated absinthe app
warning: the following files do not match any of the configured `:test_load_filters` / `:test_ignore_filters`:

test/absinthe/integration/execution/token_limit_enforcement.exs

This might indicate a typo in a test file name (for example, using "foo_tests.exs" instead of "foo_test.exs").

You can adjust which files trigger this warning by configuring the `:test_ignore_filters` option in your
Mix project's configuration. To disable the warning entirely, set that option to false.