Update guide-to-udfs notebook

[brandon-b-miller]

Updates guide-to-udf notebook to run string udf related cells conditional on the library being present and enabled.

[review-notebook-app]

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Codecov Report

Base: 87.52% // Head: 87.52% // No change to project coverage 👍

Coverage data is based on head (ff7dfff) compared to base (dfd3d89).
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Additional details and impacted files

@@              Coverage Diff              @@
##           branch-22.10   #11861   +/-   ##
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  Coverage         87.52%   87.52%           
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  Files               133      133           
  Lines             21807    21807           
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  Hits              19087    19087           
  Misses             2720     2720           

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[shwina]

Line #1.    strings_enabled = cudf.core.udf._STRING_UDFS_ENABLED

- The variable name strings_enabled feels misleading (it indicates general support for strings, rather than just for UDFs)

- Can we move this closer to where it's actually used? It's fine if we compute it redundantly for both the Series and DataFrame sections.

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