feat: concat the global_parameter_path_prefix infront of all secret env vars

[kandarpdave3]

Instead of repeatedly mentioning global_parameter_path_prefix in secret_environment_variables values, we can pass it only once as a variable and concatenate it with the values of 'secret_environment_variables' in the current module.

Example,

secret_environment_variables = {
    DB_DATABASE_NAME = "${var.global_parameter_path_prefix}/rds/default/db_name"
    DB_USERNAME            = "${var.global_parameter_path_prefix}/rds/default/db_username"
}

In the above example, we have passed var.global_parameter_path_prefix repeatedly, but from now we need to pass the global_parameter_path_prefix as a variable only and it will be concatinated with all the values, as shown in the below example.

global_parameter_path_prefix = var.global_parameter_path_prefix

secret_environment_variables = {
    DB_DATABASE_NAME = "/rds/default/db_name"
    DB_USERNAME            = "/rds/default/db_username"
}