change test validator from non upgradable bpf loader to upgradable bpf loader

[lucarlig]

Problem

while trying to run anchor test the program_data account of the program that is automatically deployed does not initialize, so some tests won't run.
If you just run anchor test against a local network, it will start a new test validator using the --bpf-program argument with solana-test-validator, which defaults to the non-upgradeable loader

Summary of Changes

just change from using bpf_loader to bpf_loader_upgradeable

reference from StackOverflow question: https://solana.stackexchange.com/questions/4632/anchorerror-caused-by-account-program-data-error-code-accountnotinitialized/4691#4691

[mvines]

@joncinque - wdyt? I think this makes sense

[joncinque]

@mvines considering solana deploy was deprecated with #28399, we can be sure that very few people mean to use the immutable loader, so it makes sense for the test validator to work that way too. Also, that person is referencing my answer, so I think it's a great idea 😁

[mvines]

Thanks @lucarlig and @joncinque