[SEMANTIC CONVENTIONS] Upgrade to semantic conventions 1.28.0

[marcalff]

Upgrade to semconv 1.28.0

This may also require to migrate from build-tools to weaver.

References:

• Prepare release 1.28.0 semantic-conventions#1458
• Announcement: sunsetting semantic conventions build tooling build-tools#322
• Use weaver for semantic convention codegen opentelemetry-rust#2098

[lmolkova]

This may also require to migrate from build-tools to weaver.

This update should not require migration to weaver unless you want to start generating event definitions, but the next version might - I'm going to create a separate issue for weaver migration.