Add release date to CHANGELOG.md file (#26926)

### Packages impacted by this PR


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### Describe the problem that is addressed by this PR


### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
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### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [ ] Added a changelog (if necessary)

sdk/healthinsights/health-insights-cancerprofiling-rest/CHANGELOG.md

@@ -1,5 +1,5 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2023-08-24)
 
 - First release of package, see README.md for details.

sdk/healthinsights/health-insights-clinicalmatching-rest/CHANGELOG.md

@@ -1,5 +1,5 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2023-08-24)
 
 - First release of package, see README.md for details.