feat: Make Python Virtual Environment Persistent: Install Persistent Environment in Computing Unit

[SarahAsad23]

What changes were proposed in this PR?

This PR adds support for installing persistent Python Virtual Environments (PVEs) into a Computing Unit (CU). All PVEs associated with a user are displayed within the CU management interface, allowing users to select and install an environment when it is needed for workflow execution.

When a PVE is installed, the environment is recreated inside the CU using the package information stored in the database. Once installation completes, the environment becomes available for Python UDF execution within that CU.

If a PVE has already been installed in a CU, users may choose to Reinstall it. During reinstallation, the packages currently installed in the CU are compared against the packages stored in the persistent PVE definition, and any missing or updated packages are applied. This allows an existing CU environment to be synchronized with the latest persistent PVE definition without requiring a full reinstall.

Users may also make package changes directly within a CU after installation. These changes remain local to the CU and are not persisted to the PVE stored in the database. A warning message is displayed in the CU management interface to indicate that manual changes made within a CU are not reflected in the persistent PVE definition.

Note: Users can no longer create virtual environments from the CU modal anymore.

Any related issues, documentation, discussions?

Closes #5361.

How was this PR tested?

Tested Manually and test cases in computing-unit-selection.component.spec.

Was this PR authored or co-authored using generative AI tooling?

Co-authored using: Claude Code

[github-actions]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.56338% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.56%. Comparing base (2ebfc28) to head (163b351).

Files with missing lines	Patch %	Lines
...wer-button/computing-unit-selection.component.html	0.00%	20 Missing ⚠️
...power-button/computing-unit-selection.component.ts	84.31%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5901      +/-   ##
============================================
- Coverage     54.91%   54.56%   -0.35%     
+ Complexity     2956     2896      -60     
============================================
  Files          1117     1110       -7     
  Lines         43133    42951     -182     
  Branches       4648     4631      -17     
============================================
- Hits          23685    23435     -250     
- Misses        18054    18145      +91     
+ Partials       1394     1371      -23     

Flag	Coverage Δ		*Carryforward flag
access-control-service	69.69% <ø> (-0.31%)	⬇️	Carriedforward from 388e6e5
agent-service	34.36% <ø> (ø)		Carriedforward from 388e6e5
amber	56.34% <ø> (-0.69%)	⬇️	Carriedforward from 388e6e5
computing-unit-managing-service	0.28% <ø> (+0.28%)	⬆️	Carriedforward from 388e6e5
config-service	54.83% <ø> (+3.27%)	⬆️	Carriedforward from 388e6e5
file-service	59.31% <ø> (+0.28%)	⬆️	Carriedforward from 388e6e5
frontend	48.68% <60.56%> (+<0.01%)	⬆️
notebook-migration-service	?
pyamber	90.20% <ø> (ø)		Carriedforward from 388e6e5
python	90.76% <ø> (ø)		Carriedforward from 388e6e5
workflow-compiling-service	57.57% <ø> (+2.42%)	⬆️	Carriedforward from 388e6e5

*This pull request uses carry forward flags. Click here to find out more.

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[kunwp1]

Left some comments.

In the PR description, please mention that user cannot create a venv anymore from the CU modal.