TLS KeyShare dissection boundary, remove conf.debug_dissector, and import test infrastructure#4957

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ali-keys wants to merge 3 commits intosecdev:masterfrom

ali-keys:fix/tls-keyshare-imports

Commits on Mar 31, 2026

contrib/automotive: remove conf.debug_dissector side-effect on import
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test/imports: refactor to concurrent.futures; add conf.debug_dissector check
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tls: fix TLS_Ext_KeyShare_SH server_share consuming trailing extensions
ali-keys
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