Update CODEOWNERS for copilot instructions and mcp (Azure#47189)

Added CODEOWNERS for copilot instructions and updated ownership for mcp tools.

Author: maririos

.github/CODEOWNERS

@@ -979,8 +979,9 @@
 /.github/                                                          @Azure/azure-java-sdk
 /.github/CODEOWNERS                                                @Azure/azure-sdk-eng @Azure/azure-java-sdk
 /.github/workflows/                                                @Azure/azure-sdk-eng
+/.github/copilot-instructions.md                                   @samvaity @praveenkuttappan @maririos
 /.config/1espt/                                                    @benbp @weshaggard
-/eng/tools/mcp/                                                    @weidongxu-microsoft @haolingdong-msft @XiaofeiCao @samvaity
+/eng/tools/mcp/                                                    @weidongxu-microsoft @haolingdong-msft @XiaofeiCao @samvaity @praveenkuttappan @maririos @Azure/azure-sdk-eng
 
 # Removing owners for this file to not require codeowner approval for changes to them given they are shared with project
 /eng/versioning/version_client.txt