refactor: SampleSection component to conditionally render based on route

[bmingles]

SampleSection component is now responsible for rendering / not rendering based on route. Contrast to before where we rendered everything and then hid via css.

Seems to cut time to run styleguide tests by more than half locally.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 46.37%. Comparing base (c9ac72d) to head (11df9d4).

❗ Current head 11df9d4 differs from pull request most recent head 58a2a63

Please upload reports for the commit 58a2a63 to get more accurate results.

Files	Patch %	Lines
...kages/code-studio/src/styleguide/SampleSection.tsx	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2000      +/-   ##
==========================================
+ Coverage   46.35%   46.37%   +0.02%     
==========================================
  Files         670      669       -1     
  Lines       38735    38713      -22     
  Branches     9806     9807       +1     
==========================================
  Hits        17955    17955              
+ Misses      20727    20705      -22     
  Partials       53       53              

Flag	Coverage Δ
unit	46.37% <94.73%> (+0.02%)	⬆️

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