Devtools: add code element's backround

[artemean]

fix(devtools): Prevent code element's backround from being overwritten. This can happen when some global styles are imported in an app (e.g. bootstrap).

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[codecov]

Codecov Report

Merging #3287 (60f1468) into master (d8c46ce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3287   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files          45       45           
  Lines        2271     2271           
  Branches      639      639           
=======================================
  Hits         2191     2191           
  Misses         77       77           
  Partials        3        3           

Impacted Files	Coverage Δ
src/devtools/styledComponents.ts	92.30% <ø> (ø)

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[tannerlinsley]

🎉 This PR is included in version 3.34.15 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[tannerlinsley]

🎉 This PR is included in version 4.0.0-alpha.12 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

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