Add validation preventing caller PDA to be garbage-collected #2223

Job	Run time
Integration Tests (Fees Test)	9m 21s
Integration Tests (Token Transfer Test)	5m 25s
Integration Tests (USDC Test)	8m 23s
Integration Tests (OOO Execution Test)	4m 24s
Integration Tests (Messaging Test)	7m 28s
Integration Tests (Fee Boosting Test)	4m 41s
Integration Tests (Batching Test)	7m 20s
Integration Tests (CCIPReader Test)	2m 29s
integration-test-ccip-ocr3	1s
	49m 32s

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