test: avoid synthesizing the CDK stack in tests multiple times

[mmalenic]

Ideally the cdk-nag tests should only have to synthesize the stack once, and base all assertions on the same stack after that. This would improve the speed at which the tests run, because it would avoid compiling code or bundling microservice assets multiple times.

[mmalenic]

Context, I think Annotations.fromStack synthesizes the stack everytime, and most tests use this method, for example:

orcabus/test/stateless/stateless-deployment.test.ts

Lines 30 to 33 in 9c8c806

	const errors = Annotations.fromStack(stack)
	.findError('*', Match.stringLikeRegexp('AwsSolutions-.*'))
	.map(synthesisMessageToString);
	expect(errors).toHaveLength(0);

In aws-cdk-lib this leads to: https:/aws/aws-cdk/blob/69cff2eda84dacfe265d518fc88ccf55930f59c4/packages/aws-cdk-lib/assertions/lib/annotations.ts#L165

[williamputraintan]

Ahh just realise, perhaps #194 fixes this?

[mmalenic]

Yes, #194 fixed this.