Adding 2026 TeXLive behind admin (#34291)

* feat: adding 2026 behind admin

* feat: bumping packer and clsi memory to accomodate new image

* align packer build and packer verify disk sizes

* feat: adding more space for packer build

GitOrigin-RevId: 1961ea7937e2c751137a4b9564a34d4e371ce0f9

services/web/docker-compose.common.env

@@ -49,7 +49,7 @@ OVERLEAF_SAML_CERT=MIIDXTCCAkWgAwIBAgIJAOvOeQ4xFTzsMA0GCSqGSIb3DQEBCwUAMEUxCzAJB
 DEVICE_HISTORY_SECRET=1b46e6cdf72db02845da06c9517c9cfbbfa0d87357479f4e1df3ce160bd54807
 QUEUE_PROCESSING_ENABLED=true
 CURRENT_IMAGE_NAME=texlive-full:2025.1
-ALLOWED_IMAGE_NAMES=[{"imageName":"texlive-full:2025.1","imageDesc":"2025"},{"imageName":"wl_texlive:2018.1","imageDesc":"2018"}]
+ALLOWED_IMAGE_NAMES=[{"imageName":"texlive-full:2026.1","imageDesc":"2026", "alphaOnly": true},{"imageName":"texlive-full:2025.1","imageDesc":"2025"},{"imageName":"wl_texlive:2018.1","imageDesc":"2018"}]
 ENABLE_PANDOC_CONVERSIONS=true
 GOOGLE_VERTEX_PROJECT=overleaf-dev
 GOOGLE_VERTEX_LOCATION=global