[Internal] 3.49.0: Adds Version bump, changelog, and contracts (#5140)

# Pull Request Template

## Description

Adds Version bump, changelog, and contracts for version 3.49.0 release

## Type of change

Please delete options that are not relevant.

- [] New feature (non-breaking change which adds functionality)


## Closing issues

To automatically close an issue: closes #IssueNumber

Author: NaluTripician

Directory.Build.props

@@ -1,8 +1,8 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 	<PropertyGroup>
-		<ClientOfficialVersion>3.48.1</ClientOfficialVersion>
-		<ClientPreviewVersion>3.49.0</ClientPreviewVersion>
-		<ClientPreviewSuffixVersion>preview.1</ClientPreviewSuffixVersion>
+		<ClientOfficialVersion>3.49.0</ClientOfficialVersion>
+		<ClientPreviewVersion>3.50.0</ClientPreviewVersion>
+		<ClientPreviewSuffixVersion>preview.0</ClientPreviewSuffixVersion>
 		<DirectVersion>3.38.0</DirectVersion>
 		<FaultInjectionVersion>1.0.0</FaultInjectionVersion>
 		<FaultInjectionSuffixVersion>beta.0</FaultInjectionSuffixVersion>