[#63195228] adjust integration_test to ensure skyscape and carrenza have same coverage

Due to the Carrenza templateVapp having 2CPU + 4096MB memory, the integration tests were not calling through to put_memory or put_cpu.

This does mean that these API requests were not being made, and we should really make them in an integration test.

Upped to 8192MB memory and 4 cpus, to ensure that they are covered.

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[#63195228] up the required coverage now we can support it

* integration tests now at 71.96%, unit tests at 75+%

arguably we should have different values for integration and unit tests, but this is sufficient for now
Merge pull request #108 from alphagov/63195228_carrenza_ci_bug

[#63195228] carrenza ci bug