Post semconv 1.39.0 updates

[chalin]

• Cleanup and fix patches in adjust-pages.pl script - Update adjust-pages.pl: drop obsolete patch, adjust apply cond for others #8874
• Apply the remaining patches to the OTel spec and submit a PR

[chalin]

@vitorvasc - can you handle the second item above? If you want I can show you to do it in a way to test your spec fixes w/o the patches applied.