Do not allow ssh authentication for functions in FIPS mode

[kwiatekus]

Description

Source of git functions cannot be fetched when controller is running in FIPS mode as the ssh handshake fails between the go-git client and git server. Such Functions wont run in FIPS mode, therefore should not be allowed in FIPS mode.

Reasons

#1984 (comment)

Acceptance Criteria

• when controller is running in fips mode and receives a git function with ssh authentication, it should leave it with ConfigurationReady=false condition and Reason="InvalidFunctionSpec" and a message explaining that the ssh authentication is not supported in FIPS mode

Testing Strategy (DoD)

• introduce a test for function reconciler verifying that Function CR (with ssh git auth) has proper status once reconciled by controller running in fips mode