fix: mount secret with SSE-C key if needed, fix secret key read. Fixes #9867

[michal-raska]

TODO:

• update github.com/argoproj/pkg once fix: add missing ServerSideEncryption param in GetDirectory. pkg#225 si merged and released

Fixes #9867

Adds mount of the SSE-C secret, if SSE-C is configured. Fixed the secret key used when reading the SSE-C key. Adds unit test to validate the mounts. Also tested inside a different project, where Argo and another component both read/write SSE-C encrypted objects from/to AWS S3.

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[tczhao]

lgtm

[tczhao]

Hi @aaronmell , Could have a look at this PR?

[aaronmell]

LGTM. I don't have write access to the Repo though, so I can't approve