Feat: pass ignores to snyk iac test [cfg-2088]

[ipapast]

• Follows CONTRIBUTING rules

What does this PR do?

This commit adds the policy file to the config file. We use the existing "policy" library to find and load the policy file.
We have decided that we can only have one .snyk file per repo, so even if we scan multiple paths, we will use the current working directory to load the .snyk file from the root of the project.

Where should the reviewer start?

How should this be manually tested?

• Make sure you have a .snyk file in the project root, or create one.
• Try with one path
  snyk-dev iac test test/fixtures/iac/terraform/sg_open_ssh.tf --experimental

Then try with multiple paths and multiple .snyk files, it should only load the one from the project root.
snyk-dev iac test test/fixtures/iac/terraform/sg_open_ssh.tf test/fixtures/iac/terraform/var_deref/nested_var_deref/variables.tf --experimental

example output of the config file:

{
  "org": "my.org",
  "apiUrl": "https://api.snyk.io/v1",
  "apiAuth": "token basdasdasdasd23423423432",
  "allowAnalytics": true,
  "policy": "# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.\nversion: v1.25.0\n# ignores vulnerabilities until expiry date; change duration by modifying expiry date\nignore:\n  SNYK-JS-ANSIREGEX-1583908:\n    - '*':\n        reason: Not affecting Snyk CLI. No upgrade path currently available\n        expires: 2022-02-01T00:00:00.000Z\n        created: 2021-11-29T17:25:19.200Z\n  SNYK-CC-K8S-4:\n    - test/fixtures/kubernetes/pod-privileged.yaml:\n        reason: None Given\n        expires: 2022-09-16T16:45:04.439Z\n        created: 2022-08-17T16:45:04.445Z\npatch: {}\n"
}

After https://github.com/snyk/snyk-iac-test/pull/93 is merged, update the checksums in this PR to include the snyk-iac-test version.

[github-actions]

	Warnings
⚠️	You've modified files in src/ directory, but haven't updated anything in test folder. Is there something that could be tested?

Generated by 🚫 dangerJS against 6d3ad76

[YairZ101]

LGTM :)