several Jest tests fails to run successfully

[hkong-mitre]

When we migrated tests from our internal git server to github, some jest tests fail because

1. git tests are failing because some of the tests are looking at specific commit IDs and file counts, which are now different
2. openSearch tests fail because it requires a local instance to be running during testing
3. cve-service tests are failing because some require a local instance, and some require real credentials

To solve these problems, we are

1. temporarily skipping failing tests (in this issue)
2. in the following issues, we will update the tests so that they run successfully
   1. jest tests for git is failing #28
   2. OpenSearch and CVE Services API tests in this library require local instances to run successfully #29
   3. openSearch tests require a local instance with preset fixture CVEs #30
   4. CVE Services tests require a local instance with preset fixture data #31