Fix secret reference error handling

[s-vitaliy]

Scope

Implemented:

• Fixed incorrect behavior when secret reference field in stream definition is missing: The SD silently hangs in Pending state. Now operator will emit an event if the secret reference field is not found in SD.

Checklist

• GitHub issue exists for this change.
• Unit tests added and they pass.
• Line Coverage is at least 80%.
• Review requested on latest commit.

[github-actions]

go-test-coverage report:

Package coverage threshold (70%) satisfied:	PASS
Total coverage threshold (75%) satisfied:	PASS
Total test coverage: 84.9% (393/463)