fix: Preserve mongo_db_major_version state after out-of-band major version upgrade#4400

marcabreracast wants to merge 6 commits intomastermongodb/terraform-provider-mongodbatlas:masterfrom

CLOUDP-399538_Preserve_MongoDBMajorVersion_Outbound_Upgradesmongodb/terraform-provider-mongodbatlas:CLOUDP-399538_Preserve_MongoDBMajorVersion_Outbound_UpgradesCopy head branch name to clipboard