Add integration tests for batchTestGenerator

[bryan-aguilar]

Integration tests for the batchTestGenerator tool should be added for each command. Ideas for command integration tests are outlined below. Most of these can be done through the use of shell commands.

local: Using a dedicated testcase input file generate a local test-case-batch file and verify that the test-case-batch file contains all expected test cases.

github: Using a dedicated testcase input file generate the github actions outputs and validate that batch-keys contains the expected keys and all test cases are present in the batch-values outputs.

validate: Setup a local DDB instance that can be prepopulated with cache items. Run the validate command and compare actual to expected results.