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resource "aws_subnet" "example" {
  cidr_block        = "10.92.117.128/25"
  vpc_id            = aws_vpc.example.id

  ... 

  tags = {
    Name = "example-subnet"
  }

  lifecycle {
    ignore_changes = [
	  "tags.%",
      "tags.cit:dc-arch-migration-description",
      "tags.cit:dc-arch-migration-target",
      "tags.cit:dc-arch-version",
      "tags.cit:dc-vgw",
      "tags.cit:subnet-type",
      "tags.cit:tgw-attachment-target",
    ]
  }
}

If your Terraform version doesn't allow you to name specific tags, you can tell it to ignore all tag changes:

   lifecycle {
     ignore_changes = [ tags ]
   } 

Or

   lifecycle {
     ignore_changes = [ "tags" ]
   }