E2E test for runtime upgrades

[alexggh]

#5738, Postmortem, has showed that we have a gap in testing with regards to runtime upgrades, one of the action items in the post mortem is to have E2E test where:

1. Spawn a zombienet test with the runtime version Westend/Rococo testnet is running.
2. Upgrade the runtime to the latest version a PR introduces.
3. Check various asserts hold true immediately after the runtime upgrade, ideas of things we can check:

• All runtime ParachainHostAPIs return expected values.
• Parachains are producing blocks as expected around the blocks we did the runtime upgrade.

[pepoviola]

Part of the test is implemented here #5794. We should add the checks you mention.
Thx!

[tdimitrov]

We also did runtime upgrade with zombienet-sdk during for the disabling tests - https://github.com/paritytech/disabling-e2e-tests/blob/452ba09ed6874e4b5a55dedb338b669cabcbf8f0/src/lib.rs#L212

[pepoviola]

I added a helper into zombienet to make more easy to permorm upgrades 😃