[Key Vault] Prepare packages for Beta release (Azure#49238)

* Prepare Secrets for release

* Prepare Certificates for release

* Prepare Admin for release

* Prepare Keys for release

Author: JonathanCrd

sdk/keyvault/Azure.Security.KeyVault.Administration/CHANGELOG.md

@@ -1,15 +1,15 @@
 # Release History
 
-## 4.6.0-beta.1 (Unreleased)
+## 4.6.0-beta.1 (2025-04-08)
 
 ### Features Added
 
-### Breaking Changes
-
-### Bugs Fixed
+- Added `StartPreRestore` and `StartPreBackup` operations to the `KeyVaultBackupClient`.
 
 ### Other Changes
 
+- The default service version is now "7.6-preview.2".
+
 ## 4.5.0 (2024-10-14)
 
 ### Features Added

sdk/keyvault/Azure.Security.KeyVault.Certificates/CHANGELOG.md

@@ -1,13 +1,11 @@
 # Release History
 
-## 4.8.0-beta.1 (Unreleased)
+## 4.8.0-beta.1 (2025-04-08)
 
 ### Features Added
 
 - New `preserveCertificateOrder` option when creating and importing certificates. It can be set as an optional paremeter in `StartCreateCertificate`, as an option in `ImportCertificateOptions`, and it can be retrieved from certificates of type `KeyVaultCertificateWithPolicy`
 
-### Breaking Changes
-
 ### Bugs Fixed
 
 - Corrected a typo in the documentation for `CertificatePolicy.KeySize`, changing the RSA key length from "4092" to "4096".

sdk/keyvault/Azure.Security.KeyVault.Keys/CHANGELOG.md

@@ -1,12 +1,13 @@
 # Release History
 
-## 4.8.0-beta.1 (Unreleased)
+## 4.8.0-beta.1 (2025-04-08)
 
 ### Features Added
 
-### Breaking Changes
-
-### Bugs Fixed
+- Added Hmac algorithms in `SignatureAlgorithm`
+- Added CkmAesKeyWrap algorithm in `EncryptionAlgorithm`
+- Added Attestation property for Keys in Managed HSM Key Vaults.
+- New `GetKeyAttestation` operation to get the public part of a stored key along with its attestation blob.
 
 ### Other Changes
 

sdk/keyvault/Azure.Security.KeyVault.Secrets/CHANGELOG.md

@@ -1,12 +1,6 @@
 # Release History
 
-## 4.8.0-beta.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 4.8.0-beta.1 (2025-04-08)
 
 ### Other Changes