Docs: Rename purgeStoredMetrics() function usage in CDK example

[ijemmy]

Bug description

In #377 , we renamed the function from purgeStoredMetrics() to publishStoredMetrics(). We missed one reference in the CDK example project. Also, we still use the term purge in one of the unit tests.

grep -rn -i "purge" . --exclude=\*venv\* --exclude=\*.git\* --exclude=\*node_modules\* --exclude=\*cdk.out\* --exclude=\*.js\* --exclude=\*.d.ts\* --exclude=\*.html\*

./examples/cdk/lib/example-function.MyFunction.ts:40:  metrics.purgeStoredMetrics();
./packages/metrics/tests/unit/Metrics.test.ts:514:    test('Purge Stored Metrics should log and clear', async () => { 

Expected Behavior

There should be no compilation issue

Current Behavior

There's a compilation issue from purgeStoredMetrics() usage

Possible Solution

Change from "purge" to "publish"

Steps to Reproduce

N/A

Environment

• Powertools version used: 0.2.0
• Packaging format (Layers, npm): npm
• AWS Lambda function runtime: N/A
• Debugging logs: N/A

Related issues, RFCs

#377

[github-actions]

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