fix(ci): fix Clang-tidy error code ignored when using HTML report mode

Description

When the HTML report mode is used, Clang-tidy error code is discarded. As such, when using warnings as errors, the Clang-tidy hook will report a success even if errors are present.

Steps to reproduce

• Take a file with a Clang-tidy error inside
• Run Sheldon where both warnings as errors and HTML report mode are enabled
• The warnings are reported as errors, but Clang-tidy hook will return successfully

Proposal

The p variable for Clang-tidy process is reused for the aha process used to generate the HTML report. Another name should be used for the aha process.

Functional specifications

Clang-tidy warnings as errors works correctly when used with HTML report mode.

Technical specifications

Rename p variable for the aha process.

Test plan

It works.