tests: Add '-test' postfix to every test file

[IvanGoncharov]

No description provided.

[codecov]

Codecov Report

Merging #319 (0089f3a) into main (b8efdbb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #319   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        19           
  Lines          587       587           
  Branches        36        36           
=========================================
  Hits           587       587           

Impacted Files	Coverage Δ
src/__tests__/starWarsConnection-test.js	100.00% <ø> (ø)
src/__tests__/starWarsMutation-test.js	100.00% <ø> (ø)
src/__tests__/starWarsObjectIdentification-test.js	100.00% <ø> (ø)
src/connection/__tests__/arrayconnection-test.js	100.00% <ø> (ø)
src/connection/__tests__/connection-test.js	100.00% <ø> (ø)
src/mutation/__tests__/mutation-test.js	100.00% <ø> (ø)
src/node/__tests__/global-test.js	100.00% <ø> (ø)
src/node/__tests__/node-test.js	100.00% <ø> (ø)
src/node/__tests__/nodeasync-test.js	100.00% <ø> (ø)
src/node/__tests__/plural-test.js	100.00% <ø> (ø)
... and 1 more

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