Revert "Enabled dependency isolation by default (#1055)"

[YunchuWang]

This reverts commit b1085b5.

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 #1092 (05ed44e) into dev (999d793) will decrease coverage by 0.19%.
The diff coverage is 100.00%.

❗ Current head 05ed44e differs from pull request most recent head 2032b29. Consider uploading reports for the commit 2032b29 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1092      +/-   ##
==========================================
- Coverage   84.08%   83.88%   -0.20%     
==========================================
  Files          34       34              
  Lines        1866     1868       +2     
  Branches      300      300              
==========================================
- Hits         1569     1567       -2     
- Misses        232      235       +3     
- Partials       65       66       +1     

Flag	Coverage Δ
unittests	83.88% <100.00%> (-0.20%)	⬇️

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

Impacted Files	Coverage Δ
azure_functions_worker/constants.py	100.00% <100.00%> (ø)
azure_functions_worker/utils/dependency.py	90.22% <100.00%> (-2.96%)	⬇️

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