chore(hive): explicitly only run prague tests via --sim.limit (#25)

This PR shouldn't change the current behavior as
[pectra-devnet-5@v1.2.0](https://github.com/ethereum/execution-spec-tests/releases/tag/pectra-devnet-5%40v1.2.0)
only contains tests filled for `Prague` and the `CancunToPragueAt15k`
transition.

It does, however, ensure the current behavior is maintained for this
hive instance for upcoming EEST releases that contain tests filled for
previously deployed forks, which will be the case when this PR gets
merged:
- ethereum/execution-spec-tests#1053

Feel free to disregard this PR, as running tests for all forks might be
desirable 😆 here's what the impact would currently be:
- Prague-only: 4062 tests.
- Until Prague: 6525 tests.

ansible/inventories/devnet-5/group_vars/hive.yaml

@@ -50,6 +50,7 @@ hive_simulations_tests:
       - --client.checktimelimit=60s
       - --sim.parallelism=8
       #- --sim.timelimit=2h
+      - --sim.limit "fork_CancunToPrague or fork_Prague"
       - --sim.buildarg fixtures=https://github.com/ethereum/execution-spec-tests/releases/download/pectra-devnet-5%40v1.2.0/fixtures_pectra-devnet-5.tar.gz
       - --sim.buildarg branch=pectra-devnet-5@v1.2.0
   # Consume RLP
@@ -64,6 +65,7 @@ hive_simulations_tests:
       - --client.checktimelimit=60s
       - --sim.parallelism=8
       #- --sim.timelimit=2h
+      - --sim.limit "fork_CancunToPrague or fork_Prague"
       - --sim.buildarg fixtures=https://github.com/ethereum/execution-spec-tests/releases/download/pectra-devnet-5%40v1.2.0/fixtures_pectra-devnet-5.tar.gz
       - --sim.buildarg branch=pectra-devnet-5@v1.2.0
   # Consume RLP