Refactor logging and error messages in serverless

[felixwang9817]

What this PR does / why we need it: This PR cleans up the logging and error messages in the AWS serverless deployments code.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1923 (b3c0832) into master (41535d0) will increase coverage by 0.05%.
The diff coverage is 32.25%.

@@            Coverage Diff             @@
##           master    #1923      +/-   ##
==========================================
+ Coverage   82.27%   82.32%   +0.05%     
==========================================
  Files          96       96              
  Lines        7470     7497      +27     
==========================================
+ Hits         6146     6172      +26     
- Misses       1324     1325       +1     

Flag	Coverage Δ
integrationtests	73.90% <32.25%> (+0.08%)	⬆️
unittests	60.11% <32.25%> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
sdk/python/feast/version.py	28.57% <ø> (ø)
sdk/python/feast/infra/aws.py	41.61% <26.31%> (+0.98%)	⬆️
sdk/python/feast/cli.py	38.79% <37.50%> (-0.49%)	⬇️
sdk/python/feast/errors.py	70.07% <50.00%> (ø)
sdk/python/feast/on_demand_feature_view.py	88.70% <0.00%> (-0.77%)	⬇️
sdk/python/feast/feature_view.py	86.25% <0.00%> (-0.33%)	⬇️
.../integration/online_store/test_universal_online.py	100.00% <0.00%> (ø)
sdk/python/feast/feature_store.py	94.33% <0.00%> (+0.53%)	⬆️
sdk/python/feast/infra/utils/aws_utils.py	71.73% <0.00%> (+0.72%)	⬆️
sdk/python/feast/feature_service.py	79.41% <0.00%> (+4.06%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 41535d0...b3c0832. Read the comment docs.

[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adchia, felixwang9817

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [adchia,felixwang9817]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[felixwang9817]

/kind housekeeping