refactor: remove redundant arm64_CI profile

The arm64_CI profile was functionally identical to the main arm64 profile.
The arm64 profile already provides proper ARM64 architecture support
with Wave containers, making the separate CI profile unnecessary.

Any CI workflows using arm64_CI should switch to the main arm64 profile.

Author: edmundmiller

tests/config/nf-test.config

@@ -46,13 +46,6 @@ profiles {
     emulate_amd64 {
         docker.runOptions       = '-u $(id -u):$(id -g) --platform=linux/amd64'
     }
-    arm64_CI {
-        // https://www.nextflow.io/docs/latest/reference/process.html#arch
-        docker.runOptions       = '-u $(id -u):$(id -g) --platform=linux/arm64'
-        process {
-            arch = 'arm64'
-        }
-    }
     singularity {
         singularity.enabled     = true
         singularity.autoMounts  = true