Honor optional flag at streaming level

[nvidianz]

Fixes #FLARE-2148

Description

Honor optional flag at streaming layer. When the message is marked as optional, all errors are logged at debug level.

Types of changes

• [x] Non-breaking change (fix or new feature that would not break existing functionality).
• [ ] Breaking change (fix or new feature that would cause existing functionality to change).
• [ ] New tests added to cover the changes.
• [ ] Quick tests passed locally by running ./runtest.sh.
• [ ] In-line docstrings updated.
• [ ] Documentation updated.

[nvidianz]

/build

[nvidianz]

/build