Give flyte binary cluster role permission to create service accounts

[shreyas44]

Why are the changes needed?

1. Flyte was failing to create service accounts on EKS since it didn't have permissions to do so
2. The service account template in the Single Cluster Simple Cloud Deployment eks-starter.yaml file was failing for the above reason

What changes were proposed in this pull request?

Give the flyte binary cluster role permissions to create new service accounts.

How was this patch tested?

Tested on an internal kubernetes cluster.

Screenshots

Before:

After:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.90%. Comparing base (02a0d2e) to head (d361c17).
Report is 121 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5579      +/-   ##
==========================================
+ Coverage   33.99%   35.90%   +1.91%     
==========================================
  Files        1135     1301     +166     
  Lines      102001   109396    +7395     
==========================================
+ Hits        34678    39284    +4606     
- Misses      63719    66016    +2297     
- Partials     3604     4096     +492     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	53.73% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.28% <ø> (?)
unittests-flyteidl	7.09% <ø> (ø)
unittests-flyteplugins	53.31% <ø> (ø)
unittests-flytepropeller	41.75% <ø> (ø)
unittests-flytestdlib	55.27% <ø> (ø)

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