feat(data): add E2E tests for DataStore docs examples

[david-mcafee]

Description of changes

feat(data): add E2E tests for DataStore docs examples

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

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 #11031 (d055abb) into main (8f6dd70) will decrease coverage by 3.76%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main   #11031      +/-   ##
==========================================
- Coverage   85.65%   81.90%   -3.76%     
==========================================
  Files         196      194       -2     
  Lines       18261    19373    +1112     
  Branches     3892     4176     +284     
==========================================
+ Hits        15642    15868     +226     
- Misses       2543     3216     +673     
- Partials       76      289     +213     

Impacted Files	Coverage Δ
...ackages/pubsub/src/Providers/AWSAppSyncProvider.ts	15.38% <0.00%> (-52.75%)	⬇️
packages/datastore/src/predicates/index.ts	78.86% <0.00%> (-17.08%)	⬇️
packages/amazon-cognito-identity-js/src/Client.js	50.48% <0.00%> (-1.52%)	⬇️
...ackages/pubsub/src/Providers/MqttOverWSProvider.ts	91.53% <0.00%> (-1.06%)	⬇️
packages/pubsub/src/PubSub.ts	92.42% <0.00%> (-0.64%)	⬇️
...ages/amazon-cognito-identity-js/src/CognitoUser.js	79.06% <0.00%> (-0.12%)	⬇️
packages/datastore/__tests__/commonAdapterTests.ts	98.26% <0.00%> (-0.07%)	⬇️
packages/datastore/src/types.ts	86.47% <0.00%> (ø)
packages/api-graphql/src/GraphQLAPI.ts	88.48% <0.00%> (ø)
packages/storage/src/common/StorageConstants.ts	85.71% <0.00%> (ø)
... and 24 more

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[manueliglesias]

LGTM 👍