APIT-2476-fix - Update function fix

[tmalikconfluent]

Original PR - #503

Testing doc: https://docs.google.com/document/d/1RCqKlMJ7Oy_h5dyeeNHKy4iN2nRSNu_22I504xpKGMg/edit?tab=t.0

[confluent-cla-assistant]

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[linouk23]

Looks great! I left a minor comment.

[linouk23]

Update: we ran the tests locally and it seems like there may be a bug as terraform apply gets stuck:

confluent_flink_statement.example: Still modifying... [id=env-mzqxx7/lfcp-2k5g3m/tf-2025-01-14-000225-76eea085-76dc-4edc-adb6-48af817f7566, 1m0s elapsed]
confluent_flink_statement.example: Still modifying... [id=env-mzqxx7/lfcp-2k5g3m/tf-2025-01-14-000225-76eea085-76dc-4edc-adb6-48af817f7566, 1m10s elapsed]
confluent_flink_statement.example: Still modifying... [id=env-mzqxx7/lfcp-2k5g3m/tf-2025-01-14-000225-76eea085-76dc-4edc-adb6-48af817f7566, 1m20s elapsed]
confluent_flink_statement.example: Still modifying... [id=env-mzqxx7/lfcp-2k5g3m/tf-2025-01-14-000225-76eea085-76dc-4edc-adb6-48af817f7566, 1m30s elapsed]
confluent_flink_statement.example: Still modifying... [id=env-mzqxx7/lfcp-2k5g3m/tf-2025-01-14-000225-76eea085-76dc-4edc-adb6-48af817f7566, 1m40s elapsed]

Most likely, the root cause is TF Provider tries to stop a statement (return flinkStatementStop(ctx, d, meta)) even for a paramPropertiesSensitive attribute update.