feat: [Memorystore for Valkey] Add support for Flexible CA feature (#… #103217

Job	Run time
CI (ubuntu-latest, 3.3, --test)	1m 7s
CI (ubuntu-latest, 3.2, --test)	1m 2s
CI (windows-latest, 4.0, --test)	3m 10s
CI (ubuntu-latest, 4.0, --test)	1m 0s
CI (macos-latest, 4.0, --test)	1m 9s
CI (ubuntu-latest, 3.1, --test)	43s
CI (ubuntu-latest, 3.4, --test)	1m 11s
CI (ubuntu-latest, 4.0, --rubocop-toplevel --rubocop --build --yard --linkinator)	1m 14s
	10m 36s

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