Increase more memory limits in flyteagent

[Future-Outlier]

Tracking issue

#3936

Why are the changes needed?

I got OOM killed When I started the flyte sandbox with the agent pod.
It is not a good user experience for agent users when we run lots os agent tasks concurrently.
As we support more agents in flytekit, we will get OOM killed.

What changes were proposed in this pull request?

Add more memory limits for flyteagent pod.

How was this patch tested?

build an image of flyte sandbox.

cd docker/sandbox-bundled
make build

Setup process

Screenshots

Agent Pod has to restart due to OOM Killed

Agent Pod doesn't have to restart after giving more memories

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 60.98%. Comparing base (b7e6959) to head (edfc9c9).
Report is 113 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5550   +/-   ##
=======================================
  Coverage   60.98%   60.98%           
=======================================
  Files         796      796           
  Lines       51647    51647           
=======================================
  Hits        31498    31498           
  Misses      17249    17249           
  Partials     2900     2900           

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.73% <ø> (ø)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	67.44% <ø> (ø)
unittests-flyteidl	79.06% <ø> (ø)
unittests-flyteplugins	61.85% <ø> (ø)
unittests-flytepropeller	57.42% <ø> (ø)
unittests-flytestdlib	65.68% <ø> (ø)

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