Changelog (since v3.4.0-RC2...v3.4.0)

• bug [HttpFoundation] Add Session::isEmpty(), fix MockFileSessionStorage to behave like the native one #25220 [HttpFoundation] Add Session::isEmpty(), fix MockFileSessionStorage to behave like the native one (@nicolas-grekas)
• bug [VarDumper] Dont use empty(), it chokes on eg GMP objects #25209 [VarDumper] Dont use empty(), it chokes on eg GMP objects (@nicolas-grekas)
• bug [HttpKernel] Arrays with scalar values passed to ESI fragment renderer throw deprecation notice #25200 [HttpKernel] Arrays with scalar values passed to ESI fragment renderer throw deprecation notice (@Simperfit)
• bug [HttpKernel] Add a better error messages when passing a private or non-tagged controller #25201 [HttpKernel] Add a better error messages when passing a private or non-tagged controller (@Simperfit)
• bug [Dotenv] Changed preg_match flags from null to 0 #25217 [Dotenv] Changed preg_match flags from null to 0 (@deekthesqueak)
• bug [DI] Fix circular reference when using setters #25180 [DI] Fix circular reference when using setters (@nicolas-grekas)
• bug [DI] Clear service reference graph #25204 [DI] Clear service reference graph (@nicolas-grekas)
• bug [DI] Fix infinite loop in InlineServiceDefinitionsPass #25203 [DI] Fix infinite loop in InlineServiceDefinitionsPass (@nicolas-grekas)
• bug [Serializer] Do not cache attributes if attributes in context #25185 [Serializer] Do not cache attributes if attributes in context (@sroze)
• bug [HttpKernel] Keep legacy container files for concurrent requests #25190 [HttpKernel] Keep legacy container files for concurrent requests (@nicolas-grekas)
• bug [HttpFoundation] AutExpireFlashBag should not clear new flashes #25182 [HttpFoundation] AutExpireFlashBag should not clear new flashes (@Simperfit, @sroze)
• bug [Translation] modify definitions only if the do exist #25174 [Translation] modify definitions only if the do exist (@xabbuh)
• bug [FrameworkBundle][Serializer] Remove YamlEncoder definition if Yaml component isn't installed #25179 [FrameworkBundle][Serializer] Remove YamlEncoder definition if Yaml component isn't installed (@ogizanagi)
• bug [DI] Prevent a ReflectionException during cache:clear when the parent class doesn't exist #25160 [DI] Prevent a ReflectionException during cache:clear when the parent class doesn't exist (@dunglas)
• bug [DI] Fix tracking of env vars in exceptions #25163 [DI] Fix tracking of env vars in exceptions (@nicolas-grekas)
• bug [HttpKernel] Read $_ENV when checking SHELL_VERBOSITY #25162 [HttpKernel] Read $_ENV when checking SHELL_VERBOSITY (@nicolas-grekas)
• bug [DI] Remove unreachable code #25158 [DI] Remove unreachable code (@GawainLynch)
• bug [Form] Don't rely on Symfony\Component\HttpFoundation\File\File if http-foundation isn't installed in FileType #25152 [Form] Don't rely on Symfony\Component\HttpFoundation\File\File if http-foundation isn't in FileType (@issei-m)
• bug [Console] Fix global console flag when used in chain #24987 [Console] Fix global console flag when used in chain (@Simperfit)
• bug Adding checks for the expression language #25137 Adding checks for the expression language (@weaverryan)
• bug [FrameworkBundle] Automatically enable the CSRF protection if CSRF manager exists #25151 [FrameworkBundle] Automatically enable the CSRF protection if CSRF manager exists (@sroze)
• bug [Yaml] added ability for substitute aliases when mapping is on single line #25043 [Yaml] added ability for substitute aliases when mapping is on single line (@michał Strzelecki, @xabbuh)