Move OrtEp sanity checks to plugin EP creation and remove check for OrtEp::ort_version_supported upper bound

[edgchen1]

Description

• Move OrtEp sanity checks from op kernel creation to EP creation.
• Remove check for upper bound of OrtEp::ort_version_supported.
• Add tests covering sanity checks.

Motivation and Context

Revert rejection of OrtEp instances that specify a version in ort_version_supported larger than ORT's ORT_API_VERSION. The guidance is for plugin EPs to set it to the ORT_API_VERSION value from their ORT header, but plugin EPs may optionally support earlier versions of ORT as well.

[Copilot]

Pull request overview

This PR adjusts plugin Execution Provider (EP) initialization so that basic OrtEp validation happens at EP creation time (instead of per-kernel creation), and it relaxes version validation to allow OrtEp::ort_version_supported values higher than the runtime’s ORT_API_VERSION. It also adds unit tests to verify the new sanity-check behavior and correct OrtEp lifetime handling on failure.

Changes:

• Added early OrtEp sanity checks during PluginExecutionProviderFactory::CreatePluginExecutionProvider().
• Removed the OrtEp::ort_version_supported <= ORT_API_VERSION upper-bound rejection (while still rejecting too-low versions).
• Added unit tests covering sanity-check failure modes and ensuring ReleaseEp is called appropriately.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
onnxruntime/test/framework/ep_plugin_provider_test.cc	Adds a test EP factory/context and new unit tests for EP-creation sanity checks and ReleaseEp behavior.
onnxruntime/core/session/plugin_ep/ep_plugin_provider_interfaces.cc	Introduces SanityCheckOrtEp() and applies it at EP creation; wraps returned OrtEp in RAII earlier.
onnxruntime/core/session/plugin_ep/ep_kernel_registration.cc	Removes now-redundant OrtEp sanity checks from kernel creation.

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[tianleiwu]

Approve

Clean refactoring that correctly moves OrtEp validation from per-kernel creation to EP creation time. Key observations:

RAII correctness: Wrapping ort_ep_raw in UniqueOrtEp immediately after the null check and before SanityCheckOrtEp guarantees proper ReleaseEp cleanup on all failure paths. The tests verify this explicitly.

Version check relaxation: Removing the ort_version_supported <= ORT_API_VERSION upper bound is well-motivated — a plugin EP compiled against a newer ORT header may still work at runtime if it supports backward compatibility. The lower bound (>= 22) correctly rejects values that cannot represent a legitimate plugin EP.

Dropped name-consistency check: The old code verified ort_ep->GetName(ort_ep) == ep->Type(). This is no longer possible at the new call site since PluginExecutionProvider hasn't been constructed yet. This is low-risk because the name is obtained from GetName during PluginExecutionProvider construction anyway, so a name mismatch would be caught downstream. Just noting for awareness.

Tests: Good coverage of all three sanity-check branches (null GetName, GetName returns null, too-low version) plus the new accepted-high-version path. The ReleaseEp tracking in the test factory is a nice touch.