Add ARM modeling leases for partner PRs 43780, 43777, 43606, 28816

[vikeshi26]

Adds ARM modeling leases (180 days from 2026-05-28, reviewer @vikeshi26) for the following partner PRs:

Partner PR	Lease path
#43780 — MongoDB.Atlas Projects/Clusters (2026-03-01-preview)	.github/arm-leases/liftrmongodb/MongoDB.Atlas/lease.yaml
#43777 — postgresql folder restructure (PostgreSql service)	.github/arm-leases/postgresql/Microsoft.DBforPostgreSQL/PostgreSql/lease.yaml
#43606 — KubernetesConfiguration KubeInventory + UpgradeAssessment (2026-06-15-preview)	.github/arm-leases/kubernetesconfiguration/Microsoft.KubernetesConfiguration/upgradeAssessment/lease.yaml (kubeInventory lease already on main)
Azure/azure-rest-api-specs-pr#28816 — encryptedtransport folder restructure (EncryptedTransport service)	.github/arm-leases/encryptedtransport/Microsoft.EncryptedTransport/EncryptedTransport/lease.yaml

Each lease:

lease:
  resource-provider: <Microsoft.X | MongoDB.Atlas>
  startdate: "2026-05-28"
  duration: P180D
  reviewer: "@vikeshi26"

[github-actions]

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Comment generated by summarize-checks workflow run.

[timotheeguerin]

@vikeshi26 this pr is causing git issue due to a case mismatch for the .github/arm-leases/postgresql/Microsoft.DBforPostgreSQL/PostgreSql/lease.yaml (There was already a file added with Sql instead of SQL)

#43887

i have a pr removing this one for now