Fix TCP target group name exceeding AWS 32-char limit

[georgidimdimitrov]

Problem

The aws_lb_target_group.tcp resource currently names target groups as:

"${var.environment_name}-tcp-tg-${1024 + count.index}"

For environment names >= 21 characters (e.g. twilight-paladin-6a43 at 21 chars), the generated name reaches 33+ characters, exceeding AWS's 32-character limit and causing terraform apply to fail:

Error: "name" cannot be longer than 32 characters
  with aws_lb_target_group.tcp[2],
  on pas-lbs.tf line 112

Fix

Use Terraform's substr() to cap the prefix and drop the redundant -tg suffix (the resource type already identifies this as a target group):

name = "${substr(var.environment_name, 0, 19)}-tcp-${1024 + count.index}"

Maximum length: 19 + 5 (-tcp-) + 4 (1028) = 28 chars, safely under the 32-char limit for any environment name.