SNOW-2317965: Refactor context_configure_development_features

[sfc-gh-yixie]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-2317965

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
   • I acknowledge that I have ensured my changes to be thread-safe. Follow the link for more information: Thread-safe Developer Guidelines
   • If adding any arguments to public Snowpark APIs or creating new public Snowpark APIs, I acknowledge that I have ensured my changes include AST support. Follow the link for more information: AST Support Guidelines

3. Please describe how your code solves the related issue.

   1. When context_configure_development_features is called, call an internal API to enable AST instead of the public session.ast_enabled = True.
   2. Refactored to be able to config dev features if there are no active sessions or multiple sessions. When a new session is created, the new session reads the developer feature config.

[graphite-app]

Type mismatch: Returns an empty list [] but the function signature declares return type as Set["Session"]. This should return an empty set instead.

return set()

While iteration works with both lists and sets, this type inconsistency could cause runtime errors if callers use Set-specific methods like .add(), .union(), etc. or type checkers will flag this as an error.

Suggested change

	return []
	return set()

Spotted by Graphite Agent



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