refactor - 3: move internal errors and fnruntime packages to pkg/lib/

[aravindtga]

Description

This PR continues the refactoring effort by moving two additional internal packages (errors and fnruntime) from internal/ to pkg/lib/ to expose them as part of the publicly accessible Library. This is the third phase of the broader refactoring effort to make key utilities available to external consumers.

Changes

Move:

• internal/errors/ → pkg/lib/errors/
• internal/fnruntime/ → pkg/lib/fnruntime/

Update:

• Import statements across multiple command and internal files to reference the new public library locations
• Error resolver components reorganized with improved package structure

This change includes updates from the following porch pull requests:

• Pass default-image-prefix to function runners nephio-project/porch#151
• Replace multi line formatting to single line formatting for kpt logs nephio-project/porch#326

Future Work

This continues the systematic refactoring to move internal packages to the public library. Additional internal packages will be evaluated and moved in subsequent phases to create a comprehensive and accessible library interface for kpt consumers.

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[liamfallon]

Looks like there were quite a few improvements to port over from Porch in this one.

[liamfallon]

It looks like the CLI tests are failing. These tests may also be duplicated, fixed, and running in Porch, it's probably worth checking.