Added some CICD best practices to the documentation

[Murdock9803]

Tracking issue

Closes #4685

Why are the changes needed?

The documentation at this page talks about Github Actions with CI/CD and Flyte. But, It can be new to many people to work with CICD process and some extra documentation will be helpful.

What changes were proposed in this pull request?

In the docs/user_guide/flyte_fundamentals/registering_workflows.md file, which can be seen deployed at this page, I added some documentation related to CI/CD best practices near the end of the file.

How was this patch tested?

The Pull Request is about simple Documentation changes.

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

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[Murdock9803]

@davidmirror-ops @samhita-alla I tried to add the documentation regarding CICD, please have a look at this PR 🙌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.35%. Comparing base (197ae13) to head (962ccfa).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5827      +/-   ##
==========================================
+ Coverage   34.48%   36.35%   +1.86%     
==========================================
  Files        1138     1304     +166     
  Lines      102742   110148    +7406     
==========================================
+ Hits        35434    40043    +4609     
- Misses      63634    65938    +2304     
- Partials     3674     4167     +493     

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> (?)
unittests-flyteidl	7.17% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	42.02% <ø> (ø)
unittests-flytestdlib	55.37% <ø> (+0.02%)	⬆️

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[Murdock9803]

I merged the changes (done by recently merged PRs) into my branch, so this PR does not have any merge conflicts 🙌