Fix a bug where series/limit failed unless simplified first

[umich-yangmi]

References to other Issues or PRs

Fixes #9173

Brief description of what is fixed or changed

Calls ratsimp on s1 to properly simplify series output

Release Notes

• core
  • changes series to return a proper simplified series/limit

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• core
  • changes series to return a proper simplified series/limit (#26543 by @abhiphile, @Abhishekjsr283204, @AlexisSchotte, @bjodah, @cherryblossom000, @Dodopalu, @eh111eh, @ehren, @ethandeguire, @haru-44, @heejaechang, @Henrique-S123, @jamesjer, @Kishore96in, @mohamedrezk122, @moorepants, @NickHarder, @oscarbenjamin, @Preypatel2413, @Qaaee123, @ricdigi, @SamLubelsky, @samuelard7, @shishir-11, @Skylion007, @smichr, @sylee957, @teschlg, @TiloRC, @tjstienstra, @Upabjojr, and @voffch)

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#### References to other Issues or PRs
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Fixes #9173


#### Brief description of what is fixed or changed

Calls ratsimp on `s1` to properly simplify series output


#### Release Notes

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* solvers
  * Added a new solver for logarithmic equations.

* functions
  * Fixed a bug with log of integers. Formerly, `log(-x)` incorrectly gave `-log(x)`.

* physics.units
  * Corrected a semantical error in the conversion between volt and statvolt which
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- core
  - changes `series` to return a proper simplified series/limit

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