* Use math/rand/v2's thread-local RNG for jitters
* Replace NewJitter() with DefaultJitter
* Replace NewFullJitter() with FullJitter
* Replace NewHalfJitter() with HalfJitter
* Replace NewSeventhJitter() with SeventhJitter
* Inline jitters in lib/utils/diagnostics/latency
* Replace var jitters in lib/utils with proxy functions
* Replace utils.HalfJitter with retryutils.HalfJitter
* Replace utils.FullJitter with retryutils.FullJitter
* Replace utils.SeventhJitter with retryutils.SeventhJitter
* Replace sharded jitters with thread-local ones
* Remove NewSeventhJitter reference in integrations