Maintenance: Resolve Ty diagnostics for modules with few issues

[ConnorKirk]

Why is this needed?

This is a sub-issue of #7902.

Several modules have only 1-2 ty diagnostics and can be resolved quickly. Fixing these enables us to remove them from the ty exclusion list and expand type checking coverage.

Which area does this relate to?

• Static typing
• Logger
• Metrics
• Middleware factory
• Validation

Solution

Resolve ty diagnostics in the following modules:

Module	Diagnostics
logging/	1
utilities/validation/	1
shared/	2
metrics/	2
middleware_factory/	2
utilities/streaming/	2

Total: 10 diagnostics

Once resolved, remove these modules from the ty exclusion list in pyproject.toml.

Acknowledgment

• This request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET