[CI] Rewind fastai2 integration tests into project-based

[bojiang]

Description

Motivation and Context

How Has This Been Tested?

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature and improvements (non-breaking change which adds/improves functionality)
• Bug fix (non-breaking change which fixes an issue)
• Code Refactoring (internal change which is not user facing)
• Documentation
• Test, CI, or build

Component(s) if applicable

• BentoService (service definition, dependency management, API input/output adapters)
• Model Artifact (model serialization, multi-framework support)
• Model Server (mico-batching, dockerisation, logging, OpenAPI, instruments)
• YataiService gRPC server (model registry, cloud deployment automation)
• YataiService web server (nodejs HTTP server and web UI)
• Internal (BentoML's own configuration, logging, utility, exception handling)
• BentoML CLI

Checklist:

• My code follows the bentoml code style, both ./dev/format.sh and
  ./dev/lint.sh script have passed
  (instructions).
• My change reduces project test coverage and requires unit tests to be added
• I have added unit tests covering my code change
• My change requires a change to the documentation
• I have updated the documentation accordingly

[codecov]

Codecov Report

Merging #1467 (0246e11) into master (bad87f1) will increase coverage by 0.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1467      +/-   ##
==========================================
+ Coverage   67.72%   68.65%   +0.92%     
==========================================
  Files         150      150              
  Lines       10017    10042      +25     
==========================================
+ Hits         6784     6894     +110     
+ Misses       3233     3148      -85     

Impacted Files	Coverage Δ
bentoml/frameworks/fastai.py	59.42% <0.00%> (-4.35%)	⬇️
bentoml/saved_bundle/config.py	88.32% <0.00%> (-0.49%)	⬇️
bentoml/__init__.py	100.00% <0.00%> (ø)
bentoml/server/api_server.py	71.42% <0.00%> (ø)
bentoml/yatai/proto/repository_pb2.py	100.00% <0.00%> (ø)
bentoml/server/utils.py
bentoml/yatai/deployment/aws_ec2/templates.py	100.00% <0.00%> (ø)
bentoml/service/__init__.py	75.49% <0.00%> (+0.07%)	⬆️
bentoml/marshal/marshal.py	25.82% <0.00%> (+0.16%)	⬆️
bentoml/configuration/containers.py	86.48% <0.00%> (+0.18%)	⬆️
... and 14 more

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[yubozhao]

LGTM