Add on failure node passing err message doc

[popojk]

Tracking issue

Related to #6181

Why are the changes needed?

In this PR, the error message will be passed to the on_failure node if an error occurs during workflow execution. We have added the relevant documentation in this PR.

What changes were proposed in this pull request?

Added a note explaining how to pass the error message to the on_failure node.

Check all the applicable boxes

• I updated the documentation accordingly.
• All commits are signed-off.

Related PRs

PR

Docs link

https://flyte--6209.org.readthedocs.build/en/6209/user_guide/development_lifecycle/failure_node.html

[flyte-bot]

Code Review Agent Run Status

• Limitations and other issues: ❌ Failure - The AI Code Review Agent skipped reviewing this change because it is configured to exclude certain pull requests based on the source/target branch or the pull request status. You can change the settings here, or contact the agent instance creator at [email protected].

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (ab463c3) to head (6c6382b).
Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6209      +/-   ##
==========================================
- Coverage   37.06%   36.90%   -0.17%     
==========================================
  Files        1318     1317       -1     
  Lines      132644   134061    +1417     
==========================================
+ Hits        49164    49474     +310     
- Misses      79230    80294    +1064     
- Partials     4250     4293      +43     

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	52.48% <ø> (-1.86%)	⬇️
unittests-flytecopilot	30.99% <ø> (ø)
unittests-flytectl	62.29% <ø> (ø)
unittests-flyteidl	7.23% <ø> (ø)
unittests-flyteplugins	53.87% <ø> (+0.02%)	⬆️
unittests-flytepropeller	42.73% <ø> (+0.02%)	⬆️
unittests-flytestdlib	55.33% <ø> (+0.04%)	⬆️

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[davidmirror-ops]

Thank you @popojk!