Fix detection of test errors

[francoisferrand]

Ensure we don't ignore test failure, through 2 layers for additional safety:

• test status validation (in archive-artifacts) now requires a non-empty test report: so test cannot unexpectedly passed due to infra or setup failure
• remove the continue-on-error, and configure test framework to exit without error after test failure (and only in that case). Thus any setup/infra/build/... would still cause the step to fail

These limitation already caused some errors to be missed, and in particular mocha test refactoring actually broke the generation of test report (now fixed).

Issue: ZENKO-5250

[bert-e]

Hello francoisferrand,

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[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers

[francoisferrand]

/approve

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/2.14

The following branches have NOT changed:

• development/2.10
• development/2.11
• development/2.12
• development/2.13
• development/2.5
• development/2.6
• development/2.7
• development/2.8
• development/2.9

Please check the status of the associated issue ZENKO-5250.

Goodbye francoisferrand.

The following options are set: approve