add EventHubBatch E2E pystein tests.

[pdthummar]

Description

Fixes #

---

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 #1052 (743db71) into dev (e4a7744) will decrease coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 743db71 differs from pull request most recent head 10da1b4. Consider uploading reports for the commit 10da1b4 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1052      +/-   ##
==========================================
- Coverage   84.01%   83.96%   -0.06%     
==========================================
  Files          34       34              
  Lines        1858     1858              
  Branches      299      299              
==========================================
- Hits         1561     1560       -1     
  Misses        232      232              
- Partials       65       66       +1     

Flag	Coverage Δ
unittests	83.96% <ø> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
azure_functions_worker/extension.py	98.16% <0.00%> (-0.92%)	⬇️

---

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 e4a7744...10da1b4. Read the comment docs.