v1.17: ensure that SPL downstream tests always succeed

[yihau]

Problem

SPL repo upgraded their dependencies version to v1.18.2 (solana-labs/solana-program-library#6278). it caused two problems

1. its patch script won't work with lower version of solana dependencies.

the patch script that is in the SPL will only update the current version to the target version so we will get this diff:

but the lock file in the SPL has already bumped to 1.18.2. it will make the build failed.

2. borsh version mismatch

due to 1, I tried to update the patch script to yihau/solana-program-library@d7c17af

it will get the diff look like:

but we still couldn't get it pass due to the borsh version mismatch.

Summary of Changes

I think it should be better to disable SPL downstream test for v1.17 instead of reverting the PR in SPL.

[joncinque]

We could also do what we did for 1.16, and create a 1.17 branch in SPL at the last 1.17 commit, and test downstream jobs against that. What do you think?

[CriesofCarrots]

We could also do what we did for 1.16, and create a 1.17 branch in SPL at the last 1.17 commit, and test downstream jobs against that.

We did the other thing