SK-2522: Fix Python SDK v2 issues reported in Bug Bash

[saileshwar-skyflow]

Why

• Issues related to Python SDK v2 were identified during the Bug Bash.

• Fixing them is required to improve reliability and align behavior with expected standards.

Outcome

• Fixed all Python SDK v2 issues identified in the Bug Bash document.

• Improved error handling and overall stability of the SDK.

[Copilot]

Pull request overview

This PR addresses multiple issues in the Python SDK v2 identified during the Bug Bash, focusing on error handling, validation logic, and connection invocation functionality.

Changes:

• Fixed error handling in connection invocation and response parsing to properly handle non-JSON content
• Corrected validation logic for wait time, credentials, and request parameters
• Added comprehensive test coverage for new error scenarios and edge cases

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/vault/controller/test__connection.py	Expanded test coverage for connection invocation with additional test cases for credentials, error handling, and metadata headers
tests/vault/client/test__client.py	Added tests for bearer token expiration, reuse, and regeneration scenarios
tests/utils/validations/test__validations.py	Updated expired token test expectation and added boundary tests for wait time validation
tests/utils/test__utils.py	Added extensive tests for response parsing, content type handling, error scenarios, and utility functions
skyflow/vault/controller/_connections.py	Reordered connection invocation logic to resolve credentials before constructing requests
skyflow/vault/client/client.py	Fixed error type for expired token from SyntaxError to SkyflowError
skyflow/utils/validations/_validations.py	Fixed validation logic for wait time, credentials, and get request; updated error messages
skyflow/utils/enums/content_types.py	Added HTML content type enum
skyflow/utils/_utils.py	Enhanced content type handling, fixed response parsing for non-JSON content, improved error handling
skyflow/utils/_skyflow_messages.py	Updated error messages for consistency and added new EXPIRED_BEARER_TOKEN message

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.