chore: Moves spec files to the src folder - iteration 6

[michael-s-molina]

SUMMARY

• Moves spec files to the src folder - iteration 6.
• Standardizes the extension of the test files.

This work is part of SIP-61

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests should pass

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[michael-s-molina]

spec/javascripts/components/ColumnTypeLabel_spec.tsx was deleted because it's a duplicate of a superset-ui test.

[codecov]

Codecov Report

Merging #16935 (5a82d56) into master (90f711f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #16935   +/-   ##
=======================================
  Coverage   76.75%   76.75%           
=======================================
  Files        1023     1024    +1     
  Lines       54907    54910    +3     
  Branches     7486     7488    +2     
=======================================
+ Hits        42145    42148    +3     
  Misses      12514    12514           
  Partials      248      248           

Flag	Coverage Δ
javascript	71.04% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...erset-frontend/src/profile/components/fixtures.tsx	100.00% <ø> (ø)

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[geido]

LGTM! Thanks for the improvement!