add legacy and pystein timer trigger e2e tests

[pdthummar]

Description

Adding legacy and Pystein timer trigger e2e tests

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[bot]]

Codecov Report

Merging #1119 (3332a77) into dev (eaa1369) will decrease coverage by 0.31%. The diff coverage is n/a.

:exclamation: Current head 3332a77 differs from pull request most recent head ad7e668. Consider uploading reports for the commit ad7e668 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1119      +/-   ##
==========================================
- Coverage   85.14%   84.83%   -0.32%     
==========================================
  Files          33       32       -1     
  Lines        1845     1813      -32     
  Branches      273      272       -1     
==========================================
- Hits         1571     1538      -33     
  Misses        205      205              
- Partials       69       70       +1     

Flag	Coverage Δ
unittests	84.83% <ø> (-0.32%)	:arrow_down:

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%)	:arrow_down:
azure_functions_worker/constants.py

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