Upgrade EDC from 0.14.0 to 0.15.1

[wahidulazam]

Description

Upgrade Eclipse Dataspace Connector (EDC) from version 0.14.0 to 0.15.1 to benefit from latest features, bug fixes, and security updates. This upgrade also pulls Eclipse IdentityHub 0.15.0 via BOM.

Upstream Changes:

• EDC 0.15.1 Release: https://github.com/eclipse-edc/Connector/releases/tag/v0.15.1
• IdentityHub 0.15.0 Release: https://github.com/eclipse-edc/IdentityHub/releases/tag/v0.15.0

Acceptance Criteria

• Upgrade EDC version in libs.versions.toml
• Fix any compilation errors from breaking changes
• All tests pass successfully
• Update CHANGELOG.md with breaking changes
• Create migration guide documenting upgrade steps
• Create PR to main branch

Additional Information

Breaking Changes Identified:

• ParticipantManifest.Builder.participantId() renamed to participantContextId() in IdentityHub 0.15.0

Impact:

• Minimal code changes required (single method rename in SuperUserSeedExtension)
• No SQL migrations needed (schema already aligned)