fix: check for invalid factor key during inputfactor

[ieow]

Motivation and Context

Jira Link:

Currently we depend on ability of factor to retrieve shareStore to reject or accept the factor.
Adding this logic checking availability of factorPub against the metadata

Description

How has this been tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project. (run lint)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code requires a db migration.

[himanshuchawla009]

lgtm