fix(generator): inspect installed distribution metadata

[artemrys]

Issue number:
#1642

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Changes

• replace pip show based library verification with installed distribution metadata lookups under the build target directory
• rename the helper to match its new behavior and remove the unused installer argument from that path
• add focused unit coverage for detecting splunktaucclib from target metadata and update related tests to reflect the new verification flow

User experience

Before this change, ucc-gen build could report that splunktaucclib was missing even when it had been installed into the add-on lib directory, because the verification step inspected the active Python environment instead of the built add-on contents.

After this change, the verification step checks the installed package metadata in the target add-on directory, so builds correctly recognize bundled splunktaucclib and other required libraries.

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Demo/meeting:

None.

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

[github-actions]

Code Coverage 🎉

Type	PR	Develop	Change	Status
Line Coverage	94.38%	94.38%	0.00%	🔴 Decreased
Branch Coverage	90.68%	90.66%	0.03%	🟢 Increased