feat(*): exception error from logs

[loicmathieu]

Revert the ErrorMessage and fetch error logs instead.

The design of the error widget must be improved, I'll open a followup issue for that.

Example from a flow failing on a task (note that there is another log prior the failing task):

Example from a concurrency limit exceeded:

Example flow with the usage of the new errorLogs() Pebble function:

id: fail
namespace: company.team

tasks:
  - id: fail
    type: io.kestra.plugin.core.execution.Fail

errors:
  - id: errorLogs
    type: io.kestra.plugin.core.log.Log
    message: |
      {%- for log in errorLogs() -%}
          - task: {{ log.taskId }}, message: {{ log.message }}
      {%- endfor -%}

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
78.9% Coverage on New Code (required ≥ 80%)

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