Antalya 25.8: CI release branch + stateless test fixes (03707, 03211)#1715

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CarlosFelipeOR wants to merge 3 commits intoantalya-25.8from

ci/use_release_branch

Commits on Apr 30, 2026

Use clickhouse-regression release branch instead of pinned commit (antalya-25.8)
CarlosFelipeOR
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Commits on May 1, 2026

Disable parallel replicas in 03707_set_index_bad_get_null_bug to match upstream master
CarlosFelipeOR
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Disable test `03211_nested_json_merges` on debug builds

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CarlosFelipeOR
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