fix: Raise Invalid Resource When DisableExecuteApiEndpoint: False And Has No DefinitionBody

[CoshUS]

Issue #, if available:
When DisableExecuteApiEndpoint is False, http api and api generator will treat it as None which means the default, True.

Description of changes:

Description of how you validated changes:

Checklist:

• Add/update tests using:
  • Correct values
  • Bad/wrong values (None, empty, wrong type, length, etc.)
  • Intrinsic Functions
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected

Examples?

Please reach out in the comments, if you want to add an example. Examples will be
added to sam init through https://github.com/awslabs/aws-sam-cli-app-templates/

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #2285 (b33373d) into develop (e7a1496) will increase coverage by 0.86%.
The diff coverage is 97.50%.

@@             Coverage Diff             @@
##           develop    #2285      +/-   ##
===========================================
+ Coverage    93.58%   94.45%   +0.86%     
===========================================
  Files           90       97       +7     
  Lines         6124     7084     +960     
  Branches      1260     1433     +173     
===========================================
+ Hits          5731     6691     +960     
+ Misses         183      179       -4     
- Partials       210      214       +4     

Impacted Files	Coverage Δ
samtranslator/model/api/http_api_generator.py	91.89% <77.77%> (+0.70%)	⬆️
samtranslator/model/api/api_generator.py	94.03% <92.72%> (-0.33%)	⬇️
samtranslator/model/apigateway.py	96.95% <96.00%> (-0.20%)	⬇️
samtranslator/__init__.py	100.00% <100.00%> (ø)
samtranslator/feature_toggle/dialup.py	100.00% <100.00%> (ø)
samtranslator/feature_toggle/feature_toggle.py	100.00% <100.00%> (+12.16%)	⬆️
samtranslator/intrinsics/actions.py	98.79% <100.00%> (+0.07%)	⬆️
samtranslator/metrics/method_decorator.py	100.00% <100.00%> (ø)
samtranslator/metrics/metrics.py	100.00% <100.00%> (ø)
samtranslator/model/__init__.py	97.64% <100.00%> (ø)
... and 34 more

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