[Docs] Deploying agents in the sandbox

[Future-Outlier]

Docs link

index: https://flyte--5107.org.readthedocs.build/en/5107/flyte_agents/index.html
content: https://flyte--5107.org.readthedocs.build/en/5107/flyte_agents/deploying_agents_to_the_flyte_sandbox.html

Tracking issue

#3936

Why are the changes needed?

Help users to develop agents more easily.

What changes were proposed in this pull request?

Setup process

Screenshots

Check all the applicable boxes

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.03%. Comparing base (d68047a) to head (1289856).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5107      +/-   ##
==========================================
+ Coverage   58.56%   59.03%   +0.46%     
==========================================
  Files         494      645     +151     
  Lines       42987    55726   +12739     
==========================================
+ Hits        25176    32896    +7720     
- Misses      15816    20233    +4417     
- Partials     1995     2597     +602     

Flag	Coverage Δ
unittests	59.03% <ø> (+0.46%)	⬆️

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[Future-Outlier]

cc @neverett
Do you know how to make the CI pass the test?
I'm not really sure about how to make it pass the test.
Thank you!

[Future-Outlier]

cc @neverett Do you know how to make the CI pass the test? I'm not really sure about how to make it pass the test. Thank you!

CI works now, please review, thanks a lot.
I'm not sure the way I embed the image here is right or not.