Add release notes for v2.6.2 (25.06)

[trvachov]

Description

Add release notes for v2.6.2 (25.06)

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactor
• Documentation update
• Other (please describe):

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• INCLUDE_SLOW_TESTS - Execute tests labelled as slow in pytest for extensive testing

Note

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Usage

TODO: Add code snippet

Pre-submit Checklist

• I have tested these changes locally
• I have updated the documentation accordingly
• I have added/updated tests as needed
• All existing tests pass successfully

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[trvachov]

/ok to test 68b4714