Because
* Building Cirrus can be time consuming
* Cirrus is not necessary for many integration tests or local workflows
* We can add a flag to enable/disable cirrus to speed up the integration
tests or local workflows that don't involve Cirrus
This commit
* Adds a flag to enable/disable Cirrus in the Makefile
* Sets the flag automatically for all Cirrus make commands
* Sets the flag for Cirrus integration tests
fixes#9910
Jared Lockhart