ENH: Test Execution for Google Collab

[mmcky]

This PR addresses https://github.com/QuantEcon/meta/issues/139

• [x] test execution of changes for Google Collab
• [x] see how we can improve results and/or update quantecon manual to retrieve errors
• [x] full test run of current lectures

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[mmcky]

@jstac this suggests that all lectures in the jax series currently run on google collab.

• [x] re-enable cache and then merge for continuous testing