kernel/proc: Move copying of resources to `process_vforkThread`

[astalke]

Description

Move copying of resources from process_copy to process_vforkThread.

Fixes: https://github.com/phoenix-rtos/phoenix-rtos-project/issues/1077 JIRA: RTOS-839

Motivation and Context

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (refactoring, style fixes, git/CI config, submodule management, no code logic changes)

How Has This Been Tested?

• [ ] Already covered by automatic testing.
• [ ] New test added: (add PR link here).
• [x] Tested by hand on: ia32-generic-qemu

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing linter checks and tests passed.
• [ ] My changes generate no new compilation warnings for any of the targets.

Special treatment

• [ ] This PR needs additional PRs to work (list the PRs, preferably in merge-order).
• [ ] I will merge this PR by myself when appropriate.

[agkaminski]

Small remark here - locks are copied as not taken, so this change should be inherently safe

[github-actions[bot]]

Unit Test Results

7 460 tests  ±0   6 745 :white_check_mark: ±0   39m 18s :stopwatch: +19s   420 suites ±0     715 :zzz: ±0      1 files   ±0       0 :x: ±0 

Results for commit 3623a41b. ± Comparison against base commit 828df3ff.