update cosmosdb e2e test to check internal fields existence

[YunchuWang]

Description

Fixes #

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1006 (01d7218) into dev (8a74a15) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1006   +/-   ##
=======================================
  Coverage   82.88%   82.88%           
=======================================
  Files          33       33           
  Lines        1776     1776           
  Branches      282      282           
=======================================
  Hits         1472     1472           
  Misses        234      234           
  Partials       70       70           

Flag	Coverage Δ
unittests	82.88% <ø> (ø)

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