update escrow test to work with non-deprecated methods

[jacksturtevant]

Updates the escrow typescript test to work with the new endpoints:

• provider.connection.confirmTransaction() updated
• program.rpc.* -> program.methods.*.rpc()

Also updates the logic of the tests so that a lot of logic is in the beforeEach(), which allows you to skip tests without breaking following tests.

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[Henry-E]

does anyone else feel like reviewing this?