v1.18: rpc: add more services to getClusterNodes (backport of #1637)

[mergify]

Problem

Not possible to get a TPU forward address for light clients.

Summary of Changes

Add tpu_forwards and tpu_forwards_quic to getClusterNodes.

---

This is an automatic backport of pull request #1637 done by Mergify.

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/web3.js (example)

Thank you for keeping the RPC clients in sync with the server API @mergify[bot].

[t-nelson]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to `rpc-client/` ([example](https://github.com/solana-labs/solana/pull/29558/files))

2. Open a follow-up PR to update the JavaScript client `@solana/web3.js` ([example](https://github.com/solana-labs/solana-web3.js/pull/2868/files))

Thank you for keeping the RPC clients in sync with the server API @mergify[bot].

what triggers this message? would be good to get it on the master PR before merge rather than on BP when it's too late

[CriesofCarrots]

what triggers this message? would be good to get it on the master PR before merge rather than on BP when it's too late

@t-nelson #1904
Plenty of examples of the message on master PRs. In this case, you necro-backported an old PR.

[t-nelson]

ah so we added that message after the master pr was merged? wasn't clear since it got triggered on that pr with the bp tag messages

[t-nelson]

@CriesofCarrots you willing to SME review this one? 🙏