Revert "fix: function names are made to match package.json's format (#…

…7988)" (#8051)

This reverts commit 25689dd.

Reverting as this breaks an E2E test, and if released, this could
break customers' automated workflows.

Co-authored-by: Colin Ihrig <colihrig@amazon.com>

packages/amplify-category-function/src/provider-utils/awscloudformation/service-walkthroughs/generalQuestionsWalkthrough.ts

@@ -19,8 +19,8 @@ function generalQuestions(context: any): object[] {
       message: 'Provide an AWS Lambda function name:',
       validate: context.amplify.inputValidation({
         operator: 'regex',
-        value: '^[a-z0-9]+$',
-        onErrorMsg: 'You can use the following characters: a-z 0-9',
+        value: '^[a-zA-Z0-9]+$',
+        onErrorMsg: 'You can use the following characters: a-z A-Z 0-9',
         required: true,
       }),
       default: () => {