Feat/tenacity rest transport retry config

[BloggerBust]

Description

This PR extends TenacityConfig to allow opt in retries for REST transport level failures (RestTransportError and subclasses), scoped to configurable HTTP methods.

There is no default behavior change:

• REST transport errors are not retried unless explicitly enabled.
• Existing retry behavior for HTTP errors, such as 5xx ServiceException, 404 NotFoundException, remains unchanged.

When retry_transport_errors=True, transport errors are retried only for configured HTTP methods. The default method set is ["GET", "DELETE"], reflecting idempotent operations.

Comprehensive unit tests validate default behavior, opt in behavior, and regression safety.

Ref: #2872

Type of change

• New feature (non-breaking change which adds functionality)
• Test changes (add, refactor, improve or change a test)

What's Changed

• Add retry_transport_errors: bool = False to TenacityConfig
• Add retry_transport_methods: list[str] (default ["GET", "DELETE"]) to TenacityConfig
• Update retry predicate in tenacity_utils.py to:
  • Retry RestTransportError only when enabled
  • Scope retries to configured HTTP methods
• Tighten method extraction regex to avoid false matches
• Add parameterized unit tests covering:
  • Default transport retry behavior (disabled)
  • Opt in behavior for allowed methods
  • Protection for non idempotent methods
  • Regression validation for existing HTTP retry behavior
  • Method extraction logic

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