Fix to store Instance Cert issued by ZTS server in cert reloader from memory instead of from file
If SIA does not issue Instance Cert, it is stored in cert reloader from file and updated by reading file 1 per second.
Fix to get Instance Cert used for mTLS with the ZTS server (for updating Instance Certs, fetching and updating Role Cert, and fetching and updating AccessToken/RoleToken) from the cert reloader.
Type of change
[ ] Bug fix
[x] New feature
[ ] Refactoring (no functional changes, no api changes)
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in the PR title if necessaryChecklist for maintainer
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