fix(ecs-patterns): 32056 remove desired task count from ecs patterns

[spensireli]

Issue # (if applicable)

Closes #32056.

Reason for this change

desiredTaskCount is deprecated and not a property of the construct in use. Instead use of minCapacity and maxCapacity should be used.

Description of changes

Documentation specified that the user could use "desiredTaskCount " for the ecs-patterns construct. However "desiredTaskCount" is not a property of queueProcessingEc2Service, nor is desiredCount. Instead minCapacity and maxCapacity should be used to specify the count.

Description of how you validated changes

Updated unit tests, ran them, and created a successful build.

Checklist

• [x ] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

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[spensireli]

Clarification Request

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e38d8ee
• Result: FAILED
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