Merge release 2.15.4 into 2.16.x

[github-actions]

Release Notes for 2.15.4

2.15.x bugfix release (patch)

2.15.4

• Total issues resolved: 0
• Total pull requests resolved: 18
• Total contributors: 8

Documentation

• 10847: Remove toc thanks to @greg0ire
• 10828: Match namespace in XML file with namespace in XSD file thanks to @greg0ire
• 10812: Remove lone dash thanks to @greg0ire
• 10800: Explain EntityManager::getReference() peculiarities thanks to @mpdude

Static Analysis

• 10842: PHPStan 1.10.25, Psalm 5.13.1 thanks to @derrabus
• 10804: Follow recommendation about multiline type thanks to @greg0ire
• 10802: Upgrade to Psalm 5.13 thanks to @greg0ire

CI

• 10824: Add dummy title to the sidebar before checking docs thanks to @greg0ire

Bug

• 10819: Fix cloning entities when using lazy-ghost proxies thanks to @nicolas-grekas
• 10813: Let XML driver treat <id> field attributes same as regular <field> tag thanks to @Greg0
• 10806: Fix enum change set recomputation on single entity thanks to @rmikalkenas
• 10791: Avoid creating unmanaged proxy instances for referred-to entities during merge() thanks to @mpdude
• 10789: distinct() updates QueryBuilder state correctly thanks to @macroparts
• 10786: Fix attach entity listener when reset class metadata factory thanks to @vuongxuongminh

Test Suite

• 10807: Move three "Ticket/"-style tests to the right namespace thanks to @mpdude
• 10803: Fix unserialize() errors when running tests on PHP 8.3 thanks to @nicolas-grekas
• 10798: Resort on Query::HINT_FORCE_PARTIAL_LOAD less thanks to @greg0ire

Code Style

• 10790: Work around slevomat/coding-standard issues thanks to @greg0ire