RC Release v0.57.0-rc1 (#11731)

# Description

RC Release v0.57.0-rc1

## Type of change

- This pull request is a minor refactor, code cleanup, test improvement,
or other maintenance task and doesn't change the functionality of Radius
(issue link optional).

## Contributor checklist
Please verify that the PR meets the following requirements, where
applicable:


- An overview of proposed schema changes is included in a linked GitHub
issue.
    - [ ] Yes <!-- TaskRadio schema -->
    - [x] Not applicable <!-- TaskRadio schema -->
- A design document PR is created in the [design-notes
repository](https://github.com/radius-project/design-notes/), if new
APIs are being introduced.
    - [ ] Yes <!-- TaskRadio design-pr -->
    - [x] Not applicable <!-- TaskRadio design-pr -->
- The design document has been reviewed and approved by Radius
maintainers/approvers.
    - [ ] Yes <!-- TaskRadio design-review -->
    - [x] Not applicable <!-- TaskRadio design-review -->
- A PR for the [samples
repository](https://github.com/radius-project/samples) is created, if
existing samples are affected by the changes in this PR.
    - [ ] Yes <!-- TaskRadio samples-pr -->
    - [x] Not applicable <!-- TaskRadio samples-pr -->
- A PR for the [documentation
repository](https://github.com/radius-project/docs) is created, if the
changes in this PR affect the documentation or any user facing updates
are made.
    - [ ] Yes <!-- TaskRadio docs-pr -->
    - [x] Not applicable <!-- TaskRadio docs-pr -->
- A PR for the [recipes
repository](https://github.com/radius-project/recipes) is created, if
existing recipes are affected by the changes in this PR.
    - [ ] Yes <!-- TaskRadio recipes-pr -->
    - [x] Not applicable <!-- TaskRadio recipes-pr -->

Signed-off-by: lakshmimsft <ljavadekar@microsoft.com>

Author: lakshmimsft

versions.yaml

@@ -1,4 +1,6 @@
 supported:
+  - channel: '0.57'
+    version: 'v0.57.0-rc1'
   - channel: '0.56'
     version: 'v0.56.1'
 deprecated: