test(aws): resize all mosip cluster nodes t3a.2xlarge → m6a.2xlarge (Part of #273, #437)

[bhumi46]

Part of #273, part of #437

Tests the current all-nodes behaviour of k8s_instance_type (the per-node override is #466). Test value — revert before GH-issue-273-v2 merges to develop (tracked in #437). Expect a few minutes of full-cluster downtime on the test cluster.

What

profiles/mosip/aws/compute.tfvars: k8s_instance_type t3a.2xlarge → m6a.2xlarge (same 8 vCPU / 32 GiB, x86_64 — same AMI; offered in ap-south-1a/b; non-burstable). nginx_instance_type unchanged.

Expected — COMPONENT=compute, PROFILE=mosip

• Plan: 0 to add, 8 to change, 0 to destroy — aws_instance.k8s_cluster[*]: ~ instance_type = "t3a.2xlarge" -> "m6a.2xlarge", update in-place (no replacement). nginx unchanged.
• Apply: all 8 nodes stopped, resized and started together (cluster down meanwhile). Same instance IDs, private IPs and disks.
• Afterwards: RKE2 services start on boot → kubectl get nodes 8 × Ready; etcd back with 3 members. No configure needed.
• If the plan shows any must be replaced / destroy — do not apply.

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