roachtest: deflake activerecord

Currently, the activerecord test can fail due to flakes inside client
side encryption tests, which aren't linked to CRDB. To address this,
this patch marks them as flaky.

Fixes: #157810

Release note: None

Author: fqazi

pkg/cmd/roachtest/tests/activerecord_blocklist.go

@@ -50,6 +50,8 @@ var activeRecordIgnoreList = blocklist{
 	`ActiveRecord::CockroachDBStructureDumpTest#test_structure_dump`:                                                                                           "flaky",
 	`ActiveRecord::ConnectionAdapters::ConnectionPoolThreadTest#test_checkout_fairness_by_group`:                                                               "flaky",
 	`ActiveRecord::ConnectionAdapters::PostgreSQLAdapterTest#test_translate_no_connection_exception_to_not_established`:                                        "pg_terminate_backend not implemented",
+	`ActiveRecord::Encryption::EncryptableRecordApiTest#test_ciphertext_for_returns_the_ciphertext_of_a_new_value`:                                             "flaky",
+	`ActiveRecord::Encryption::EncryptableRecordApiTest#test_ciphertext_for_returns_the_ciphertext_of_a_value_when_the_record_is_new`:                          "flaky",
 	`ActiveRecord::Encryption::EncryptableRecordTest#test_by_default,_it's_case_sensitive`:                                                                     "flaky",
 	`ActiveRecord::Encryption::EncryptableRecordTest#test_forced_encoding_for_deterministic_attributes_will_replace_invalid_characters`:                        "flaky",
 	`ActiveRecord::Encryption::UniquenessValidationsTest#test_uniqueness_validations_work_when_using_old_encryption_schemes`:                                   "flaky",