test: fix config tests failing when a platform is not installed

[tido64]

Description

Nightly builds fail when some platforms are not present

Platforms affected

• Android
• iOS
• macOS
• visionOS
• Windows

Test plan

• packages/app/example:

  % node --test test/config.test.mjs
  ▶ react-native config
    ✔ contains Android config (587.807625ms)
    ✔ contains iOS config (123.6665ms)
    ﹣ contains macOS config (0.060583ms) # SKIP
    ﹣ contains Windows config (0.0495ms) # SKIP
  ✔ react-native config (770.607791ms)
  ℹ tests 5
  ℹ suites 0
  ℹ pass 3
  ℹ fail 0
  ℹ cancelled 0
  ℹ skipped 2
  ℹ todo 0
  ℹ duration_ms 822.166625
  

• packages/example-macos (on macOS):

  % node --test test/config.test.mjs
  ▶ react-native config
    ✔ contains Android config (592.220875ms)
    ✔ contains iOS config (130.035708ms)
    ✔ contains macOS config (127.364542ms)
    ﹣ contains Windows config (0.07625ms) # SKIP
  ✔ react-native config (908.558208ms)
  ℹ tests 5
  ℹ suites 0
  ℹ pass 4
  ℹ fail 0
  ℹ cancelled 0                                                                                              ℹ skipped 1                                                                                                ℹ todo 0
  

• packages/example-windows (on macOS):

  % node --test test/config.test.mjs
  ▶ react-native config
    ✔ contains Android config (696.737792ms)
    ✔ contains iOS config (119.9925ms)
    ﹣ contains macOS config (0.055042ms) # SKIP
    ﹣ contains Windows config (0.050125ms) # SKIP
  ✔ react-native config (876.34325ms)
  ℹ tests 5
  ℹ suites 0
  ℹ pass 3
  ℹ fail 0
  ℹ cancelled 0
  ℹ skipped 2
  ℹ todo 0
  ℹ duration_ms 939.712416