Re-enable COSE- UVM endorsements test

[maxtropets]

Closes #7479.

• Enable the test
• Require application/octet-stream for new format
• Shall this be backported to 6.x?..: No: Re-enable COSE- UVM endorsements test #7598 (comment)

[Copilot]

Pull request overview

This PR re-enables the UVM endorsements test for version 0.2.10 and adds support for the new application/octet-stream content type format. The changes properly handle both legacy JSON-based endorsements and the new binary format that carries the SVN in CWT claims.

Changes:

• Added new constant for application/octet-stream content type
• Restructured content type validation to support both legacy and new endorsement formats
• Updated test data and assertions for UVM 0.2.10 with corrected measurements and EKU values

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/uvm_endorsements/uvm_0.2.10.cose	New binary test file containing COSE-signed UVM endorsements
src/node/cose_common.h	Added constant for application/octet-stream content type
src/node/uvm_endorsements.cpp	Restructured content type validation based on SVN presence in CWT claims
src/node/test/endorsements.cpp	Updated test with correct measurement hash, EKU value, and re-enabled assertions

[achamayou]

Shall this be backported to 6.x?..

This is not a bugfix, and there is no immediate plan from ACI to stop providing the endorsements in the old format, so there is no reason I can see to backport it to 6.x.