Allow specific reservation for node-group in slurm-gcp v5

[harshthakkar01]

Manual testing with 3 node-groups

For all specific reservation: --> No errors.

For 1 automatic reservation:

│   79:       condition     = coalesce(self.specific_reservation_required, true)
│     ├────────────────
│     │ self.specific_reservation_required is false
│
│ your reservation has to be specific,
│       see https://cloud.google.com/compute/docs/instances/reservations-overview#how-reservations-work
│       for more information. if it's intentionally automatic, don't specify
│       it in the blueprint.

For 2 automatic reservation:

Plan: 33 to add, 0 to change, 0 to destroy.
╷
│ Error: Resource postcondition failed
│
│   on modules/embedded/community/modules/compute/schedmd-slurm-gcp-v5-partition/main.tf line 79, in data "google_compute_reservation" "reservation":
│   79:       condition     = coalesce(self.specific_reservation_required, true)
│     ├────────────────
│     │ self.specific_reservation_required is false
│
│ your reservation has to be specific,
│       see https://cloud.google.com/compute/docs/instances/reservations-overview#how-reservations-work
│       for more information. if it's intentionally automatic, don't specify
│       it in the blueprint.
╵
╷
│ Error: Resource postcondition failed
│
│   on modules/embedded/community/modules/compute/schedmd-slurm-gcp-v5-partition/main.tf line 79, in data "google_compute_reservation" "reservation":
│   79:       condition     = coalesce(self.specific_reservation_required, true)
│     ├────────────────
│     │ self.specific_reservation_required is false
│
│ your reservation has to be specific,
│       see https://cloud.google.com/compute/docs/instances/reservations-overview#how-reservations-work
│       for more information. if it's intentionally automatic, don't specify
│       it in the blueprint.

For 1 automatic and 1 not found.

Plan: 33 to add, 0 to change, 0 to destroy.
╷
│ Error: Resource postcondition failed
│
│   on modules/embedded/community/modules/compute/schedmd-slurm-gcp-v5-partition/main.tf line 74, in data "google_compute_reservation" "reservation":
│   74:       condition     = self.self_link != null
│     ├────────────────
│     │ self.self_link is null
│
│ couldn't find the reservation helloautomaticreservation123}
╵
╷
│ Error: Resource postcondition failed
│
│   on modules/embedded/community/modules/compute/schedmd-slurm-gcp-v5-partition/main.tf line 79, in data "google_compute_reservation" "reservation":
│   79:       condition     = coalesce(self.specific_reservation_required, true)
│     ├────────────────
│     │ self.specific_reservation_required is false
│
│ your reservation has to be specific,
│       see https://cloud.google.com/compute/docs/instances/reservations-overview#how-reservations-work
│       for more information. if it's intentionally automatic, don't specify
│       it in the blueprint.

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