[release/6.0] Fix incorrect CCW decoding in GetObjectForCCW

[tommcdon]

Backport of #61193 to release/6.0

/cc @davmason @mikem8361 @hoyosjs

Customer Impact

This issue blocks debugger API's for correctly identifying .NET 5.0+ COM wrappers.

Testing

Validated an end-to-end scenario using COM wrappers

Risk

Low. We are falling back to the old COM decoding logic if the new COM wrapper API code check does not succeed.

[dotnet-issue-labeler]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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Issue Details

---

Backport of #61193 to release/6.0

/cc @davmason @mikem8361 @hoyosjs

Customer Impact

This issue blocks debugger API's for correctly identifying .NET 5.0+ COM wrappers.

Testing

Validated an end-to-end scenario using COM wrappers

Risk

Low. We are falling back to the old COM decoding logic if the new COM wrapper API code check does not succeed.

Author:	tommcdon
Assignees:	-
Labels:	Servicing-consider, area-Diagnostics-coreclr
Milestone:	-

[jeffschwMSFT]

Approved. Let's consider this for 6.0.x