[Docs] Recover the expected behaviors of example workflows

[JiangJiaWei1103]

Why are the changes needed?

1. The import statement of Echo is missing.
2. The demonstration of the workflow shape_properties_accept_conditional_output is ignored in the main function right below it.
3. The descriptions of expected outputs of the workflow consume_task_output are inverted.

What changes were proposed in this pull request?

Reassign the example code url with the new gitsha and align code lines.

Check all the applicable boxes

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

Related PRs

The modified version of the example code in Flytesnacks can be found in this PR

Docs link

https://flyte--5880.org.readthedocs.build/en/5880/user_guide/advanced_composition/conditionals.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.71%. Comparing base (bdaf79f) to head (47bf054).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5880   +/-   ##
=======================================
  Coverage   36.71%   36.71%           
=======================================
  Files        1304     1304           
  Lines      130081   130081           
=======================================
  Hits        47764    47764           
  Misses      78147    78147           
  Partials     4170     4170           

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.41% <ø> (ø)
unittests-flytecopilot	11.73% <ø> (ø)
unittests-flytectl	62.40% <ø> (ø)
unittests-flyteidl	6.89% <ø> (ø)
unittests-flyteplugins	53.62% <ø> (ø)
unittests-flytepropeller	42.84% <ø> (ø)
unittests-flytestdlib	54.78% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.