chore: add ianhou to mergify and GH merit badger configs (#32759)

### Issue # (if applicable)

N/A.

### Reason for this change

<!--What is the bug or use case behind this change?-->

Onboarding a new engineer.

### Description of changes

<!--
What code changes did you make?
Have you made any important design decisions?
What AWS use cases does this change enable? To enable the use cases,
which AWS service features are utilized?
-->

Configuration changes only. Added iankhou (ianhou@) to exception list
for GH merit badger and to Mergify config.

### Describe any new or updated permissions being added

<!— What new or updated IAM permissions are needed to support the
changes being introduced ? -->

No changes in IAM are required.

### Description of how you validated changes

<!--Have you added any unit tests and/or integration tests?-->

Config change only, no tests were changed.

### Checklist - N/A
- [] My code adheres to the [CONTRIBUTING
GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and
[DESIGN
GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache-2.0 license*

Co-authored-by: Ian Hou <[email protected]>
Co-authored-by: Kaizen Conroy <[email protected]>

Author: 3 people

.github/workflows/github-merit-badger.yml

@@ -17,4 +17,4 @@ jobs:
           badges: '[beginning-contributor,repeat-contributor,valued-contributor,admired-contributor,star-contributor,distinguished-contributor]'
           thresholds: '[0,3,6,13,25,50]'
           badge-type: 'achievement'
-          ignore-usernames: '[rix0rrr,iliapolo,otaviomacedo,kaizencc,comcalvi,TheRealAmazonKendra,mrgrain,pahud,kellertk,ashishdhingra,HBobertz,sumupitchayan,colifran,khushail,moelasmar,paulhcsun,GavinZZ,aaythapa,xazhao,gracelu0,jfuss,shikha372,kirtishrinkhala,godwingrs22,bergjaak,IanKonlog,Leo10Gama,samson-keung,scorbiere,michelle-wangg,jiayiwang7,1kaileychen,saiyush,5d,aws-cdk-automation,dependabot[bot],mergify[bot]]'
+          ignore-usernames: '[rix0rrr,iliapolo,otaviomacedo,kaizencc,comcalvi,TheRealAmazonKendra,mrgrain,pahud,kellertk,ashishdhingra,HBobertz,sumupitchayan,colifran,khushail,moelasmar,paulhcsun,GavinZZ,aaythapa,xazhao,gracelu0,jfuss,shikha372,kirtishrinkhala,godwingrs22,bergjaak,IanKonlog,Leo10Gama,samson-keung,scorbiere,michelle-wangg,jiayiwang7,1kaileychen,saiyush,5d,iankhou,aws-cdk-automation,dependabot[bot],mergify[bot]]'

.mergify.yml

@@ -43,7 +43,7 @@ pull_request_rules:
       label:
         add: [ contribution/core ]
     conditions:
-      - author~=^(rix0rrr|iliapolo|otaviomacedo|kaizencc|comcalvi|TheRealAmazonKendra|mrgrain|pahud|ashishdhingra|kellertk|HBobertz|sumupitchayan|colifran|moelasmar|paulhcsun|GavinZZ|aaythapa|xazhao|gracelu0|jfuss|shikha372|kirtishrinkhala|godwingrs22|bergjaak|samson-keung|IanKonlog|Leo10Gama|scorbiere|michelle-wangg|jiayiwang7|1kaileychen|saiyush|5d)$
+      - author~=^(rix0rrr|iliapolo|otaviomacedo|kaizencc|comcalvi|TheRealAmazonKendra|mrgrain|pahud|ashishdhingra|kellertk|HBobertz|sumupitchayan|colifran|moelasmar|paulhcsun|GavinZZ|aaythapa|xazhao|gracelu0|jfuss|shikha372|kirtishrinkhala|godwingrs22|bergjaak|samson-keung|IanKonlog|Leo10Gama|scorbiere|michelle-wangg|jiayiwang7|1kaileychen|saiyush|5d|iankhou)$
       - -label~="contribution/core"
   - name: automatic merge
     actions: