C++ standard fobids specializations of is_trivially_copyable

[aalkin]

• Introduce is_forced_trivially_copyable
• Use it in the definition of is_messageable

[github-actions]

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[pzhristov]

I confirm that this PR fixes the compilation issues on Tahoe 26.4 with Root v6-36-10-alice1. All the tests are Ok. The issues on aarch64 can be investigated after merging it.