Only return exit code 1, if that's what the spec run did

[Blacksmoke16]

Context

It seems that kcov can return 127 sometimes, likely due to a bug. This was causing an issue making the CI job fail due to non-zero exit code. This PR makes it a bit more strict by only failing the script if it failed with exit code 1.

Changelog

• Fix unexpected non zero exit codes in scripts/test.sh

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Before merging, remember to add the athena-framework/athena prefix to the PR number in the PR title

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
compiled	8.14% <ø> (-0.02%)	⬇️
unit	92.77% <ø> (ø)

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Components	Coverage Δ
clock	98.18% <ø> (ø)
console	92.61% <ø> (ø)
dependency_injection	64.28% <ø> (ø)
dotenv	96.80% <ø> (ø)
event_dispatcher	82.75% <ø> (ø)
framework	94.27% <ø> (ø)
image_size	95.03% <ø> (ø)
mercure	93.37% <ø> (ø)
negotiation	97.69% <ø> (ø)
routing	92.96% <ø> (ø)
serializer	87.23% <ø> (ø)
spec	93.54% <ø> (ø)
validator	92.37% <ø> (ø)

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