Add minimal version to failure nodes docs

[eapolinario]

Tracking issue

Closes #5811

Why are the changes needed?

A user in the OSS slack was confused when their failure node workflow didn't work.

What changes were proposed in this pull request?

Add a warning to the failure nodes docs page.

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.35%. Comparing base (b9900fe) to head (d5af4ee).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5812   +/-   ##
=======================================
  Coverage   36.35%   36.35%           
=======================================
  Files        1304     1304           
  Lines      110147   110147           
=======================================
  Hits        40042    40042           
  Misses      65938    65938           
  Partials     4167     4167           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.60% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (ø)
unittests-flyteidl	7.17% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	42.02% <ø> (ø)
unittests-flytestdlib	55.37% <ø> (ø)

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[chenyuan99]

LGTM

[neverett]

@eapolinario I think you need to merge master in to your branch to fix the docs test failure, but lmk if that doesn't do the trick.