test(supply-chain-app-backend): fix via-npm-script.test.ts hanging

[petermetz]

1. The test case was hanging at the end because it was waiting for a
   magic string to appear in the logs to indicate that the booting has finished.
2. The problems began when we changed the supply chain app's log message
   from mentioning Cactus to Cacti which then invalidated the condition forever.
3. This left it hanging indefinitely and the test case was broken.
4. Now to fix the problem and avoid this happening again in the future
   the supply chain app exports the log message pattern as a variable and the
   test case imports that directly so if we change the log message in the
   future it will automatically make sure that the test is also waiting for
   the updated log message pattern to show up in the logs making this class
   of bugs impossible to happen.

Signed-off-by: Peter Somogyvari [email protected]

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