ci: don't fail fast

[sam-golioth]

Runs all HIL tests, even if one fails, instead of exiting after the first failure.

A test run in CI where I forced the OTA test to fail is here: https://github.com/golioth/golioth-firmware-sdk/actions/runs/9354727595

Resolves golioth/firmware-issue-tracker#577

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Code Coverage

Type	Coverage
lines	58.6% (1266 of 2160 lines)
functions	65.3% (126 of 193 functions)