Bring in test-podspec.sh

Bring in test-podspec.sh into commons for base implementation maintenance
* Note that since this script can be useful for local development, it should be easily copy-pasteable instead of implemented as a reusable workflow

### Expected Behaviour

### Actual Behaviour

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce

#### Platform and Version

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Start by locating the existing test-podspec.sh script and the commons project's conventions for scripts used in local development. Bring the script into commons as an easily copy-pasteable implementation rather than a reusable workflow, then verify that the resulting script supports the intended podspec test workflow.

Written by the indexing model from the issue text.