[VAULT-40236] IBM license integration changelog (#13281) (#13460)

* add changelog

* add more release notes

* change file name

* separate telemetry metric

Co-authored-by: Jenny Deng <jenny.deng@hashicorp.com>

Author: hc-github-team-secure-vault-core

changelog/_13281.txt

@@ -0,0 +1,24 @@
+```release-note:feature
+**IBM PAO License Integration**: Added IBM PAO license support, allowing usage of Vault Enterprise with an IBM PAO license key.
+A new configuration stanza `license_entitlement` is required in the Vault config to use an IBM license. For more details, see
+the [License documentation](https://developer.hashicorp.com/vault/docs/license#ibm-pao-license-keys).
+```
+
+```release-note:change
+license utilization reporting (enterprise): Manual reporting bundles generated by `vault operator utilization` have a changed format.
+Notably they contain an array of `snapshot_records` instead of `snapshots`. The `decoded_snapshot` field in each record contains
+the human-readable data that was previously in the `snapshots` array.
+```
+
+```release-note:improvement
+license utilization reporting (enterprise): Utilization reports now include new license metadata fields `issuer`, `edition`, `add_ons`,
+`license_start_time`, `license_expiration_time`, and `license_termination_time`. 
+
+```release-note:improvement
+core (enterprise): New license fields `architecture`, `os`, `issuer`, `edition`, and `add_ons` have been added to the output of
+`vault license inspect`, `vault license get`, and the `/sys/license/status` API endpoint.
+```
+
+```release-note:improvement
+core (enterprise): Added a new telemetry metric `vault.core.license.termination_time_epoch`.
+```