[#5594][Platform]:Handle invalid certs/keys correctly. (#7264)

* Heading:
[5594][Platform] Handle invalid certs/keys correctly
Description:
We wanted to verify the cert at upload time itself.
Testing:
When we try to upload selfSigned cert, we were able to upload any
garbage files. Now with this fix, we have handled this scenrio. User
won't be able to upload garbage file. Incase of self signed cert upload
workflow, We are matching the modulus of
cert RSA Public key with the modulus of its private key if its matched
then it means certs are valid otheriwse Invalid.
For CA Cert, we are just validating the Cert format.
Added the unit Tests as well.

(cherry picked from commit 5f8d39a)

* Heading:
[5594][Platform] Handle invalid certs/keys correctly
Description:
We wanted to verify the cert at upload time itself.
Testing:
When we try to upload selfSigned cert, we were able to upload any
garbage files. Now with this fix, we have handled this scenrio. User
won't be able to upload garbage file. Incase of self signed cert upload
workflow, We are matching the modulus of
cert RSA Public key with the modulus of its private key if its matched
then it means certs are valid otheriwse Invalid.
For CA Cert, we are just validating the Cert format.
Added the unit Tests as well.

(cherry picked from commit 5f8d39a)

Co-authored-by: jitendra-12113 <jitedra.kumar@hashedin.com>