test(@angular/cli): remove Safari 15 test

[alan-agius4]

Safari v15 is longer included in the default browserlist configuration of CLI apps.

[alfaproject]

@alan-agius4 should the name of the test file be updated or even the file removed altogether? It still mentions Safari 15

[alan-agius4]

Safari 15 is still support but not by default. Users needs to opt-in by adding it in their browserslist config.

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