Use cmake for cleaning in cmake job

[peterschrammel]

instead of make

Based on #8487

• Each commit message has a non-empty body, explaining why the change was made.
• [n/a] Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• [n/a] The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• [n/a] Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.52%. Comparing base (5556082) to head (7bec581).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8547   +/-   ##
========================================
  Coverage    80.52%   80.52%           
========================================
  Files         1705     1705           
  Lines       188927   188927           
  Branches        73       73           
========================================
  Hits        152130   152130           
  Misses       36797    36797           

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[Copilot]

Pull request overview

This PR updates the CMake-based CI cleanup flow so the check-ubuntu-24_04-cmake-gcc job uses cmake --build ... --target clean instead of Make-based clean commands, while teaching CMake about a few source-tree artifacts that need removal.

Changes:

• Register scripts/bash-autocomplete/cbmc.sh as an additional clean file for the cbmc.sh custom target.
• Register top-level regression log files as additional clean files in the CMake regression targets.
• Replace the workflow’s manual make ... clean cleanup commands with cmake --build build --target clean plus targeted find ... -delete cleanup.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/cbmc/CMakeLists.txt	Adds CMake clean metadata for the generated bash completion script.
regression/CMakeLists.txt	Adds CMake clean metadata for the top-level regression log file.
jbmc/CMakeLists.txt	Adds CMake clean metadata for Java regression outputs and log files.
.github/workflows/pull-request-checks.yaml	Switches the CMake CI job’s cleanup step from Make-based cleaning to CMake-based cleaning plus manual artifact deletion.

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