[Fix-14601][UI] Ironed out the issue with choosing an environment on the task form of both types of DMS and DATASYNC.

[calvinjiang]

Purpose of the pull request

This PR will close #14601 .

Brief change log

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This pull request is code cleanup without any test coverage.

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This change added tests and can be verified as follows:

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[codecov-commenter]

Codecov Report

Merging #14605 (d7383b2) into dev (3d033da) will increase coverage by 0.04%.
The diff coverage is n/a.

❗ Current head d7383b2 differs from pull request most recent head 50020fc. Consider uploading reports for the commit 50020fc to get more accurate results

@@             Coverage Diff              @@
##                dev   #14605      +/-   ##
============================================
+ Coverage     38.46%   38.51%   +0.04%     
- Complexity     4561     4566       +5     
============================================
  Files          1260     1260              
  Lines         43793    43793              
  Branches       4833     4833              
============================================
+ Hits          16844    16865      +21     
+ Misses        25079    25052      -27     
- Partials       1870     1876       +6     

see 7 files with indirect coverage changes

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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No Coverage information
0.0% Duplication