Allow specifying accepted avisories for SWHardeningNeeded TCB status

[daniel-weisse]

#729 added support for reading the Security Advisories if attestation failed due to invalid TCB status.
This PR builds on that to allow users to specify just specific advisories when the reported TCB status is SWHardeningNeeded

Proposed changes

• Add a new flag to the CLI --accepted-advisories which allows specifying a list of Intel Security Advisories to accept if the Coordinator's TCB status is SWHardeningNeeded. If not set, all advisories are accepted
• Add a new manifest field Packages.AcceptedAdvisories which allows specifying a list of Intel Security Advisories to accept if the package's TCB status is SWHardeningNeeded. If not set, all advisories are accepted
• Fix for the CLI printing a nil error if parsing the advisory list of a report failed

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